diff --git a/app/controllers/concerns/submission_scoring.rb b/app/controllers/concerns/submission_scoring.rb
index 279e7a05..b04f0fe2 100644
--- a/app/controllers/concerns/submission_scoring.rb
+++ b/app/controllers/concerns/submission_scoring.rb
@@ -92,5 +92,13 @@ module SubmissionScoring
         output.except!(:error_messages, :count, :failed, :filename, :message, :passed, :stderr, :stdout)
       end
     end
+
+    # Return all test results except for those of a linter if not allowed
+    show_linter = Python20CourseWeek.show_linter? submission.exercise
+    outputs&.reject do |output|
+      next if show_linter || output.blank?
+
+      output[:file_role] == 'teacher_defined_linter'
+    end
   end
 end
diff --git a/lib/python20_course_week.rb b/lib/python20_course_week.rb
new file mode 100644
index 00000000..7d510ea6
--- /dev/null
+++ b/lib/python20_course_week.rb
@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+class Python20CourseWeek
+
+  def self.get_for(exercise)
+    case exercise.title
+    when /Python20 Aufgabe 1/
+      1
+    when /Python20 Aufgabe 2/
+      2
+    when /Python20 Aufgabe 3/
+      3
+    when /Python20 Aufgabe 4/
+      4
+    when /Python20 Snake/
+      4
+    else
+      # Not part of the Python20 course
+      nil
+    end
+  end
+
+  def self.show_linter?(exercise)
+    week = get_for(exercise)
+    return true if week.nil? # Exercise is not part of the experiment
+
+    [3, 4].include?(week)
+  end
+end