Top example is positive; bottom example is negative. Alco-screen product insert/instructions.
Disclaimer: Forensic use only
“In vitro diagnostic products are those reagents, instruments, and systems intended for use in the diagnosis of disease or other conditions, including a determination of the state of health, in order to cure, mitigate, treat, or prevent disease or its sequelae. Such products are intended for use in the collection, preparation, and examination of specimens taken from the human body.” — Source: FDA.gov
Devices or products listed on the Rapid Exams website as "Forensic use only" are not FDA cleared and should not be used for in-vitro medical diagnostic or treatment purposes. These products should not be used for “at home” or “over-the-counter” sales in the U.S. or its territories nor are they intended to be marketed or sold to end users via the Internet.