The CAF Rapid Test is for the qualitative detection of caffeine in specimen that can be performed with the use of LF Reader. Caffeine , is a central nervous system (CNS) stimulant of the methylxanthine class. It is the world's most widely consumed psychoactive drug. It is found in the seeds, nuts, or leaves of a number of plants native to South America and East Asia and confers on them several survival and reproductive benefits.