In response to recent research indicating that common crime is higher in England than in the United States, the I-ADAM (International Arrestee Drug Use Monitoring) program Research Report, Comparing Drug Use Rates of Detained Arrestees in the United States and England, takes an indepth look at the prevalence of drug use in the two countries. Similarities and differences are analyzed in various contexts including: rates of drug use, urinalysis versus self-reports in measuring drug use, drug injection, treatment for alcohol and drug abuse, drug-using careers, and legal and illegal income. Findings indicate that arrestees in England are more prone to use opiates, methadone, and amphetamines and that cocaine use is more popular among United States arrestees. This possibly suggests that certain market conditions must exist for specific drugs to thrive.