Mikey
n.— «The tablets were seized during a probation check from a local drug user who is a so-called “Mikey” (a volunteer “guinea pig” who is willing to “test” (by self-administration) illicit drugs and drug mixtures of virtually any type).» —“Fentanyl Tablets In Polk County, Florida” by Drug Enforcement Administration Microgram Bulletin Nov., 2003. (source: Double-Tongued Dictionary)