Abstract: A multi-segment label set form especially for use in the testing of drugs. One embodiment has a first label segment with a permanent adhesive backing layer and second and third label segments with temporary adhesive backing layers. The first and second label segments contain information to identify the patient participating in the test, the drug being tested, and other study information. The third label segment contains or can be marked to contain hidden information as to whether the particular patient has been prescribed a drug or a placebo. The hidden information is concealed by a cover portion of the third label segment which can be removed by the patient's physician in the event of medical emergency. The first and third label segments are cut with tamper evident slits. V-cut cusps or notches are disposed between the first and second label segments to facilitate removal of the second and third label segments from the first label segment.