diff --git a/README.md b/README.md
index c4260cd..f364e9d 100644
--- a/README.md
+++ b/README.md
@@ -102,7 +102,10 @@ return PyrameterConfig::defaults()
     );
 ```
 
-`PyrameterConfig::defaults()` includes rules for common database, cache, filesystem, Symfony functional test, Panther, and WebDriver usage.
+`PyrameterConfig::defaults()` includes rules for common database usage (including CodeIgniter database tests),
+cache, filesystem, Symfony and CodeIgniter controller functional tests, Panther, and WebDriver usage.
+CodeIgniter tests using both `ControllerTestTrait` and `DatabaseTestTrait` remain functional; database-only tests
+are integration tests.
 
 Use `PyrameterConfig::create()` instead when you want to start with no rules or targets and define everything yourself:
 
diff --git a/composer.json b/composer.json
index 7824543..2303d7a 100644
--- a/composer.json
+++ b/composer.json
@@ -22,6 +22,7 @@
     "autoload-dev": {
         "psr-4": {
             "Boundwize\\Pyrameter\\Tests\\": "tests/",
+            "CodeIgniter\\Test\\": "tests/Fixtures/Stubs/CodeIgniter/Test/",
             "Doctrine\\DBAL\\": "tests/Fixtures/Stubs/Doctrine/DBAL/",
             "Facebook\\WebDriver\\": "tests/Fixtures/Stubs/Facebook/WebDriver/",
             "Symfony\\Bundle\\FrameworkBundle\\Test\\": "tests/Fixtures/Stubs/Symfony/Bundle/FrameworkBundle/Test/",
diff --git a/src/Config/PyrameterConfig.php b/src/Config/PyrameterConfig.php
index fedebed..7446ba8 100644
--- a/src/Config/PyrameterConfig.php
+++ b/src/Config/PyrameterConfig.php
@@ -7,6 +7,8 @@
 use Boundwize\Pyrameter\Rule\UsageRule;
 use Boundwize\Pyrameter\Rule\UsageType;
 use Boundwize\Pyrameter\TestKind;
+use CodeIgniter\Test\ControllerTestTrait;
+use CodeIgniter\Test\DatabaseTestTrait;
 use InvalidArgumentException;
 use mysqli;
 use PDO;
@@ -108,9 +110,16 @@ public static function defaults(): self
             ->usesClass('RedisSentinel', TestKind::Integration)
             ->usesNamespace('Predis\\', TestKind::Integration)
             ->usesNamespace('Symfony\Bundle\FrameworkBundle\Test\\', TestKind::Functional)
+            ->usesClass(ControllerTestTrait::class, TestKind::Functional)
             ->usesNamespace('Symfony\Component\Panther\\', TestKind::E2E)
             ->usesNamespace('Facebook\WebDriver\\', TestKind::E2E);
 
+        $pyrameterConfig->usageRules[] = new UsageRule(
+            DatabaseTestTrait::class,
+            TestKind::Integration,
+            unless: [ControllerTestTrait::class],
+        );
+
         foreach (self::FILE_OPERATION_FUNCTIONS as $functionName) {
             $pyrameterConfig->usesFunction($functionName, TestKind::Integration);
         }
diff --git a/src/Rule/UsageRule.php b/src/Rule/UsageRule.php
index 7450b06..964a014 100644
--- a/src/Rule/UsageRule.php
+++ b/src/Rule/UsageRule.php
@@ -17,10 +17,14 @@
 
 final readonly class UsageRule
 {
+    /**
+     * @param list<string> $unless
+     */
     public function __construct(
         public string $usage,
         public TestKind $kind,
         private UsageType $usageType = UsageType::ClassLike,
+        private array $unless = [],
     ) {
     }
 
@@ -55,6 +59,20 @@ public function normalizedKey(): string
         return $this->usageKey($this->usageType, $this->normalizedUsage());
     }
 
+    /**
+     * @return list<string>
+     */
+    public function normalizedUnlessKeys(): array
+    {
+        $normalizedUnlessKeys = [];
+
+        foreach ($this->unless as $unlessUsage) {
+            $normalizedUnlessKeys[] = $this->usageKey($this->usageType, $this->normalize($unlessUsage));
+        }
+
+        return $normalizedUnlessKeys;
+    }
+
     private function normalize(string $usage): string
     {
         return strtolower(ltrim($usage, '\\'));
diff --git a/src/UsageClassifier.php b/src/UsageClassifier.php
index 8bf4136..59833e3 100644
--- a/src/UsageClassifier.php
+++ b/src/UsageClassifier.php
@@ -7,6 +7,7 @@
 use Boundwize\Pyrameter\Rule\UsageRule;
 use Boundwize\Pyrameter\Rule\UsageType;
 
+use function array_keys;
 use function ltrim;
 use function sprintf;
 use function str_contains;
@@ -18,10 +19,10 @@
 
 final readonly class UsageClassifier
 {
-    /** @var array<string, TestKind> */
+    /** @var array<string, list<array{kind: TestKind, unless: list<string>}>> */
     private array $exactRules;
 
-    /** @var list<array{usage: string, kind: TestKind}> */
+    /** @var list<array{usage: string, kind: TestKind, unless: list<string>}> */
     private array $namespaceRules;
 
     /**
@@ -35,14 +36,18 @@ public function __construct(array $rules)
         foreach ($rules as $rule) {
             if ($rule->isNamespaceRule()) {
                 $namespaceRules[] = [
-                    'usage' => $rule->normalizedKey(),
-                    'kind'  => $rule->kind,
+                    'usage'  => $rule->normalizedKey(),
+                    'kind'   => $rule->kind,
+                    'unless' => $rule->normalizedUnlessKeys(),
                 ];
 
                 continue;
             }
 
-            $this->addExactRule($exactRules, $rule->normalizedKey(), $rule->kind);
+            $exactRules[$rule->normalizedKey()][] = [
+                'kind'   => $rule->kind,
+                'unless' => $rule->normalizedUnlessKeys(),
+            ];
         }
 
         $this->exactRules     = $exactRules;
@@ -54,13 +59,21 @@ public function __construct(array $rules)
      */
     public function classify(array $consumedUsages): TestKind
     {
-        $kind = TestKind::Unit;
+        $kind                     = TestKind::Unit;
+        $normalizedConsumedUsages = [];
 
         foreach ($consumedUsages as $consumedUsage) {
-            $normalizedConsumedUsage = $this->normalizeConsumedUsage($consumedUsage);
+            $normalizedConsumedUsage                            = $this->normalizeConsumedUsage($consumedUsage);
+            $normalizedConsumedUsages[$normalizedConsumedUsage] = true;
+        }
+
+        foreach (array_keys($normalizedConsumedUsages) as $normalizedConsumedUsage) {
+            foreach ($this->exactRules[$normalizedConsumedUsage] ?? [] as $exactRule) {
+                if ($this->isSuppressed($exactRule['unless'], $normalizedConsumedUsages)) {
+                    continue;
+                }
 
-            if (isset($this->exactRules[$normalizedConsumedUsage])) {
-                $kind = $this->heaviest($kind, $this->exactRules[$normalizedConsumedUsage]);
+                $kind = $this->heaviest($kind, $exactRule['kind']);
 
                 if ($kind === TestKind::E2E) {
                     return $kind;
@@ -68,7 +81,10 @@ public function classify(array $consumedUsages): TestKind
             }
 
             foreach ($this->namespaceRules as $namespaceRule) {
-                if (! $this->matchesNamespaceRule($normalizedConsumedUsage, $namespaceRule['usage'])) {
+                if (
+                    ! $this->matchesNamespaceRule($normalizedConsumedUsage, $namespaceRule['usage'])
+                    || $this->isSuppressed($namespaceRule['unless'], $normalizedConsumedUsages)
+                ) {
                     continue;
                 }
 
@@ -84,13 +100,18 @@ public function classify(array $consumedUsages): TestKind
     }
 
     /**
-     * @param array<string, TestKind> $rules
+     * @param list<string> $unless
+     * @param array<string, true> $normalizedConsumedUsages
      */
-    private function addExactRule(array &$rules, string $usage, TestKind $testKind): void
+    private function isSuppressed(array $unless, array $normalizedConsumedUsages): bool
     {
-        $rules[$usage] = isset($rules[$usage])
-            ? $this->heaviest($rules[$usage], $testKind)
-            : $testKind;
+        foreach ($unless as $unlessUsage) {
+            if (isset($normalizedConsumedUsages[$unlessUsage])) {
+                return true;
+            }
+        }
+
+        return false;
     }
 
     private function heaviest(TestKind $left, TestKind $right): TestKind
diff --git a/tests/Fixtures/CodeIgniterFunctionalFixture.php b/tests/Fixtures/CodeIgniterFunctionalFixture.php
new file mode 100644
index 0000000..e2ed2b0
--- /dev/null
+++ b/tests/Fixtures/CodeIgniterFunctionalFixture.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Boundwize\Pyrameter\Tests\Fixtures;
+
+use CodeIgniter\Test\ControllerTestTrait;
+use CodeIgniter\Test\DatabaseTestTrait;
+use PHPUnit\Framework\TestCase;
+
+final class CodeIgniterFunctionalFixture extends TestCase
+{
+    use ControllerTestTrait;
+    use DatabaseTestTrait;
+
+    public function testItUsesTheControllerTestRuntime(): void
+    {
+        $this->addToAssertionCount(1);
+    }
+}
diff --git a/tests/Fixtures/CodeIgniterIntegrationFixture.php b/tests/Fixtures/CodeIgniterIntegrationFixture.php
new file mode 100644
index 0000000..d08e455
--- /dev/null
+++ b/tests/Fixtures/CodeIgniterIntegrationFixture.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Boundwize\Pyrameter\Tests\Fixtures;
+
+use CodeIgniter\Test\DatabaseTestTrait;
+use PHPUnit\Framework\TestCase;
+
+final class CodeIgniterIntegrationFixture extends TestCase
+{
+    use DatabaseTestTrait;
+
+    public function testItUsesTheDatabaseTestRuntime(): void
+    {
+        $this->addToAssertionCount(1);
+    }
+}
diff --git a/tests/Fixtures/Stubs/CodeIgniter/Test/ControllerTestTrait.php b/tests/Fixtures/Stubs/CodeIgniter/Test/ControllerTestTrait.php
new file mode 100644
index 0000000..6f5e482
--- /dev/null
+++ b/tests/Fixtures/Stubs/CodeIgniter/Test/ControllerTestTrait.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodeIgniter\Test;
+
+trait ControllerTestTrait
+{
+}
diff --git a/tests/Fixtures/Stubs/CodeIgniter/Test/DatabaseTestTrait.php b/tests/Fixtures/Stubs/CodeIgniter/Test/DatabaseTestTrait.php
new file mode 100644
index 0000000..e523f88
--- /dev/null
+++ b/tests/Fixtures/Stubs/CodeIgniter/Test/DatabaseTestTrait.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodeIgniter\Test;
+
+trait DatabaseTestTrait
+{
+}
diff --git a/tests/Rule/UsageRuleTest.php b/tests/Rule/UsageRuleTest.php
index 6863fb8..553bc5c 100644
--- a/tests/Rule/UsageRuleTest.php
+++ b/tests/Rule/UsageRuleTest.php
@@ -61,4 +61,15 @@ public function testUsageTypesExposeStablePrefixes(): void
         $this->assertSame('class', UsageType::ClassLike->value);
         $this->assertSame('function', UsageType::Function->value);
     }
+
+    public function testItNormalizesUnlessUsages(): void
+    {
+        $usageRule = new UsageRule(
+            'Framework\DatabaseTrait',
+            TestKind::Integration,
+            unless: ['\FRAMEWORK\ControllerTrait'],
+        );
+
+        $this->assertSame(['class:framework\controllertrait'], $usageRule->normalizedUnlessKeys());
+    }
 }
diff --git a/tests/UsageClassificationTest.php b/tests/UsageClassificationTest.php
index c9f553e..d77cc8b 100644
--- a/tests/UsageClassificationTest.php
+++ b/tests/UsageClassificationTest.php
@@ -8,6 +8,8 @@
 use Boundwize\Pyrameter\Detection\ConsumedUsageExtractor;
 use Boundwize\Pyrameter\Detection\TestUsageScanner;
 use Boundwize\Pyrameter\TestKind;
+use Boundwize\Pyrameter\Tests\Fixtures\CodeIgniterFunctionalFixture;
+use Boundwize\Pyrameter\Tests\Fixtures\CodeIgniterIntegrationFixture;
 use Boundwize\Pyrameter\Tests\Fixtures\ContainerGetHeavyFixture;
 use Boundwize\Pyrameter\Tests\Fixtures\DoctrineUsageFixture;
 use Boundwize\Pyrameter\Tests\Fixtures\FileOperationUsageFixture;
@@ -57,6 +59,14 @@ public static function classificationCases(): iterable
         yield 'Doctrine DBAL usage means integration' => [DoctrineUsageFixture::class, TestKind::Integration];
         yield 'file operation usage means integration' => [FileOperationUsageFixture::class, TestKind::Integration];
         yield 'Symfony WebTestCase means functional' => [SymfonyFunctionalFixture::class, TestKind::Functional];
+        yield 'CodeIgniter controller and database traits mean functional' => [
+            CodeIgniterFunctionalFixture::class,
+            TestKind::Functional,
+        ];
+        yield 'CodeIgniter DatabaseTestTrait means integration' => [
+            CodeIgniterIntegrationFixture::class,
+            TestKind::Integration,
+        ];
         yield 'Panther usage means e2e' => [PantherE2EFixture::class, TestKind::E2E];
         yield 'WebDriver usage means e2e' => [WebDriverE2EFixture::class, TestKind::E2E];
         yield 'mocked heavy class stays unit' => [MockedHeavyFixture::class, TestKind::Unit];
diff --git a/tests/UsageClassifierTest.php b/tests/UsageClassifierTest.php
index 403814f..cbff8a5 100644
--- a/tests/UsageClassifierTest.php
+++ b/tests/UsageClassifierTest.php
@@ -102,6 +102,24 @@ public function testDuplicateExactRulesUseTheHeaviestKind(): void
         $this->assertSame(TestKind::Integration, $usageClassifier->classify(['App\Service']));
     }
 
+    public function testRuleCanBeSuppressedByAnotherConsumedUsage(): void
+    {
+        $usageClassifier = new UsageClassifier([
+            new UsageRule('Framework\DatabaseTrait', TestKind::Integration, unless: ['Framework\ControllerTrait']),
+            new UsageRule('Framework\ControllerTrait', TestKind::Functional),
+        ]);
+
+        $this->assertSame(
+            TestKind::Functional,
+            $usageClassifier->classify(['Framework\ControllerTrait', 'Framework\DatabaseTrait']),
+        );
+        $this->assertSame(
+            TestKind::Functional,
+            $usageClassifier->classify(['Framework\DatabaseTrait', 'Framework\ControllerTrait']),
+        );
+        $this->assertSame(TestKind::Integration, $usageClassifier->classify(['Framework\DatabaseTrait']));
+    }
+
     public function testHeaviestMatchingRuleWinsAfterRulesArePrecompiled(): void
     {
         $usageClassifier = new UsageClassifier([