| Region 4 | ||||||||
| Adult Primary Drug of Abuse | ||||||||
| Source: IDHW Client Information System | ||||||||
| Common Compounds | 1999-2000 | 2000-2001 | 2001-2002 | 2002-2003 | 2004-2005 | 2005-2006 | 2006-2007 | 2007-2008 |
| Alcohol | 390 | 563 | 528 | 411 | 196 | 319 | 340 | 238 |
| Methamphetamines | 212 | 280 | 220 | 156 | 208 | 419 | 686 | 611 |
| Marijuana | 117 | 160 | 98 | 77 | 66 | 129 | 216 | 155 |
| Cocaine | 27 | 24 | 6 | 5 | 6 | 11 | 16 | 26 |
| Heroin | 39 | 28 | 22 | 12 | 8 | 20 | 15 | 27 |
| Other Compounds | 1999-2000 | 2000-2001 | 2001-2002 | 2002-2003 | 2004-2005 | 2005-2006 | 2006-2007 | 2007-2008 |
| Non-Rx Methadone | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 2 |
| Other Opiates/Synth | 7 | 14 | 5 | 8 | 12 | 18 | 27 | 37 |
| PCP | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Hallucinogens | 1 | 0 | 1 | 0 | 2 | 0 | 1 | 2 |
| Other Amphetamines | 1 | 1 | 0 | 0 | 0 | 1 | 2 | 4 |
| Other Inhalants | 0 | 0 | 0 | 0 | ||||
| Benzodiazpine | 0 | 0 | 0 | 0 | 2 | 1 | 0 | 0 |
| Other Tranquilizers | 2 | 1 | 2 | 1 | 0 | 0 | 0 | 0 |
| Barbituates | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
| Other Sedatives | 2 | 3 | 1 | 1 | 0 | 1 | 0 | 0 |
| Inhalants | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 4 |
| Over-the-Counter | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 1 |
| Other | 0 | 1 | 2 | 0 | 0 | 0 | 1 | 0 |
| None | 6 | 1 | 1 | 2 | 0 | 0 | 0 | 0 |