at the fairfax county adult detention center, repeat offender brenda brewer has seen plenty of inmates come and go over the years. the latest to leave was sabrina monahan. having completed a short sentence for drug possession. before she left, monahan was subjected to a urine test. after brewer told staff she'd been trading commissary snacks for prescription drugs. while monahan passed the test and was exonerated, brewer admits to having dealt her own medication in the past. >> it all depends on the type of medicine they give me and if it make me high, i go out there and i see a white girl would like to get high and i sell my medicine to her. uh-huh. >> supporting her drug habit on the outside is what had led to brewer's 30-year-long revolving-door relationship with the jail. >> my pattern is to get out of here, go out there and steal, smoke crack dope. that's the first thing i look