diff --git a/app/Http/Controllers/ProfilesApiController.php b/app/Http/Controllers/ProfilesApiController.php
index a3d9aeb0..cb707810 100644
--- a/app/Http/Controllers/ProfilesApiController.php
+++ b/app/Http/Controllers/ProfilesApiController.php
@@ -59,9 +59,6 @@ public function index(ProfilesApiRequest $request): JsonResponse
             }
 
             if ($request->boolean('with_data')) {
-                if(count(array_filter($request->query())) <=1){
-                    return response()->json(['error' => 'Please use a filter when pulling data.'], 400);
-                }
                 $profile = $profile->withApiData($request->input('data_type'));
             }
 
diff --git a/app/Http/Requests/ProfilesApiRequest.php b/app/Http/Requests/ProfilesApiRequest.php
index dd46bba1..9c10060c 100644
--- a/app/Http/Requests/ProfilesApiRequest.php
+++ b/app/Http/Requests/ProfilesApiRequest.php
@@ -2,10 +2,9 @@
 
 namespace App\Http\Requests;
 
-use App\Profile;
 use App\Rules\AllowedProfileDataType;
 use Illuminate\Foundation\Http\FormRequest;
-use Illuminate\Validation\Rule;
+use Illuminate\Validation\ValidationException;
 
 class ProfilesApiRequest extends FormRequest
 {
@@ -27,14 +26,22 @@ public function authorize()
     public function rules()
     {
         return [
-            'person' => 'sometimes|string',
-            'search' => 'sometimes|string',
-            'search_names' => 'sometimes|string',
-            'info_contains' => 'sometimes|string',
-            'from_school' => 'sometimes|string',
-            'tag' => 'sometimes|string',
+            'person' => ['sometimes', 'string', 'regex:/^[a-zA-Z0-9.;]+$/'],
+            'search' => ['sometimes', 'string', 'regex:/^[a-zA-Z0-9\s,\.]*$/', 'min:3'],
+            'search_names' => ['sometimes', 'string', 'regex:/^[a-zA-Z0-9\s,\.]*$/', 'min:3'],
+            'info_contains' => ['sometimes', 'string', 'regex:/^[a-zA-Z0-9\s,\.]*$/', 'min:3'],
+            'from_school' => [
+                'sometimes',
+                'string',
+                'regex:/^[a-zA-Z0-9\s;,\.]+$/',
+            ],
+            'tag' => ['sometimes', 'string', 'alpha_num', 'min:3'],
             'public' => 'sometimes|boolean',
-            'with_data' => 'sometimes|boolean',
+            'with_data' => [
+                'sometimes',
+                'boolean',
+               $this->validateWithData(),
+            ],
             'raw_data' => 'sometimes|boolean',
             'data_type' => [
                 'sometimes',
@@ -43,4 +50,29 @@ public function rules()
             ],
         ];
     }
+
+    public function validateWithData()
+    {
+        return function ($attribute, $value, $fail) {
+            if ($value && empty($this->person)) {
+                $fail('Invalid parameter.');
+            }
+        };
+    }
+
+    protected function passedValidation(): void
+    {
+        $allowedKeys = array_keys($this->rules());
+
+        $extraKeys = collect($this->all())
+            ->keys()
+            ->diff($allowedKeys);
+
+        if ($extraKeys->isNotEmpty()) {
+            throw ValidationException::withMessages([
+                'extra_parameters' => 'Invalid parameter.',
+            ]);
+        }
+    }
+
 }
diff --git a/app/Rules/AllowedSchools.php b/app/Rules/AllowedSchools.php
new file mode 100644
index 00000000..4df2e577
--- /dev/null
+++ b/app/Rules/AllowedSchools.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Rules;
+
+use App\School;
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+
+class AllowedSchools implements ValidationRule
+{
+    /**
+     * Run the validation rule.
+     *
+     * @param  \Closure(string): \Illuminate\Translation\PotentiallyTranslatedString  $fail
+     */
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        $allowed_schools = School::where('short_name', '!=', 'Other')
+                                    ->pluck('short_name')
+                                    ->toArray();
+
+        if(!in_array($value, $allowed_schools)){
+            $fail("Invalid value for school.");
+        }
+
+    }
+}
diff --git a/tests/Feature/ApiTest.php b/tests/Feature/ApiTest.php
index 9617694d..90e8f601 100644
--- a/tests/Feature/ApiTest.php
+++ b/tests/Feature/ApiTest.php
@@ -67,19 +67,6 @@ public function testApi()
             $response->assertJsonFragment($this->profileJsonFragment($profiles[$i]));
         }
 
-        ////////////////////////////
-        // All profiles with data //
-        ////////////////////////////
-
-        // profiles.test/api/v1?with_data=1
-        $response = $this->get(route('api.index', ['with_data' => 1]));
-
-        $response
-            ->assertStatus(400)
-            ->assertJson([
-                'error' => "Please use a filter when pulling data.",
-            ]);
-
         ////////////////////////////////
         // Certain profiles with data //
         ////////////////////////////////
@@ -117,6 +104,112 @@ public function testApi()
             ->assertJsonFragment($this->profileInfoJsonFragment($profiles[0]->data->first()));
     }
 
+    /**
+     * Test validation fails for profiles with data when 'person' is missing
+     * 
+     * Endpoint: profiles.test/api/v1?with_data=1
+     */
+    public function testWithDataFails()
+    {
+        $response = $this->get(route('api.index', ['with_data' => 1]));
+
+        $response
+            ->assertStatus(422)
+            ->assertJsonValidationErrors('with_data')
+            ->assertJson([
+                'errors' => [
+                    'with_data' => ["Invalid parameter."],
+                ],
+            ]);
+    }
+
+    /**
+     * Test validation fails for 'person' that includes an invalid character
+     * 
+     * Endpoint: profiles.test/api/v1?person=invalid#char
+     */
+    public function testPersonFails()
+    {
+        $response = $this->get(route('api.index', ['person' => 'invalid#char']));
+
+        $response
+            ->assertStatus(422)
+            ->assertJsonValidationErrors('person');
+    }
+
+    /**
+     * Test validation fails for an invalid profile data type
+     * 
+     * Endpoint: profiles.test/api/v1?data_type=invalid_type
+     */
+    public function testDataTypeFails()
+    {
+        $response = $this->get(route('api.index', ['data_type' => 'invalid_type']));
+
+        $response
+            ->assertStatus(422)
+            ->assertJsonValidationErrors('data_type');
+    }
+
+    /**
+     * Test validation fails for an invalid value for from_school
+     * 
+     * Endpoint: profiles.test/api/v1?from_school=Other
+     */
+    public function testSchoolFails()
+    {
+        $response = $this->get(route('api.index', ['from_school' => 'Other:']));
+
+        $response
+            ->assertStatus(422)
+            ->assertJsonValidationErrors('from_school');
+    }
+
+    /**
+     * Test validation fails for:
+     * Non-alphanumeric characters in 'search'
+     * 'search_names' values shorter than 3 characters
+     * Non-string values in 'info_contains'
+     */
+    public function testSearchFails()
+    {
+        $parameters = [
+            'search' => 'invalid_search_entry!',
+            'search_names' => 'No',
+            'info_contains' => ['not', 'a', 'string'],
+        ];
+
+        $response = $this->get(route('api.index', $parameters));
+
+        $response
+            ->assertStatus(422)
+            ->assertJsonValidationErrors('search')
+            ->assertJson([
+                'errors' => [
+                    'search' => ["The search format is invalid."],
+                ],
+            ]);
+
+        $response
+            ->assertJsonValidationErrors('search_names')
+            ->assertJson([
+                'errors' => [
+                    'search_names' => ["The search names must be at least 3 characters."],
+                ],
+            ]);
+        
+        $response
+            ->assertJsonValidationErrors('info_contains')
+            ->assertJson([
+                'errors' => [
+                    'info_contains' => [
+                                        "The info contains must be a string.",
+                                        "The info contains format is invalid.",
+                                    ],
+                    ],
+            ]);
+    }
+
     /**
      * Get the proper Profile JSON fragment
      *