Working in a chemistry lab is a privilege, which requires students to know and abide by the rules and to behave in a responsible manner. The Lab License® is awarded to students after they have passed a safety exam early in the semester. When a student breaks a safety rule, he or she gets a punch on the Lab License. If a student receives three safety citations within a grading period, that student’s license is suspended, and he or she must retake the safety exam. Lab Licenses are an innovative and effective way to ensure safety rules are followed in your laboratory. 4¼" × 3½". Package of 100.