/sigh 5 billion of foreign drug war money + 9 billion for prison time + a few billion for just making the arrest + funding for DEA etc that alone starts to add up to real money. You are a pork barrel politician's dream, you dismiss things compared to the federal budget, but when added up cost a fortune.
Anyway..
1998 report by the National Institute on Drug Abuse (NIDA) and the National Institute on Alcohol Abuse and Alcoholism (NIAAA) estimated the economic costs of illegal drug abuse in the United States to be $97.66 billion in 1992. Sixty percent (60%) of drug costs were due to drug-related law enforcement, incarceration and crime. Only 3% of drug costs were from victims of drug-related crime.
60% of 98 billion is a heck of a lot of money. (hint: its around 60 billion annually). Over a 10 year period (assuming it has/will remained stagnent which isn't likely as funding has increased every year), thats closing in on 1 trillion dollars saved.
Source: National Institute on Drug Abuse and National Institute on Alcohol Abuse and Alcoholism. The Economic Costs of Alcohol and Drug Abuse in the United States, 1992 (Washington, DC: US Department of Health and Human Services, May 1998), Table 1.2, pp. 1-6.