| Region 1 | |||||||
| Adult Primary Drug of Abuse by County | |||||||
| Source: IDHW Client Information System | |||||||
| Alcohol | Methamphetamines | Marijuana | Cocaine | Heroin | |||
| 2001 | `348 | 159 | 129 | 12 | 9 | ||
| 2002 | 360 | 175 | 106 | 8 | 3 | ||
| 2005 | 417 | 316 | 145 | 17 | 11 | ||
| 2006 | 614 | 530 | 264 | 18 | 12 | ||
| 2007 | 499 | 504 | 206 | 14 | 20 | ||
| 2008 | 324 | 375 | 145 | 22 | 28 | ||