1.   An emerging facet of the problem is the use of heroin among meth addicts.

2.   Counselors have been attacked by meth addicts who are tweaking, or coming off a high.

3.   He befriended a crystal meth addict who is also a police informant and videotaped him during a three-hour interview while the informant was high on the drug.

4.   Meth addicts become paranoid, delusional and violent.