the control line across the top tells us that the test was valid. as long as there's a line by every number then the test was negative. >> one inmate has refused to comply with the drug test. >> 604. >> four. >> the inmate is martin mcdaniel who is serving 15 years for three counts of burglary. >> he is going to the ccu which is the custody control unit. they take offenders down there that are troublemakers, who refuse orders, who have been in fights, what have you. >> officers inspecting mcdaniel's cell soon make a discovery. >> i'll call the nurse. this is prescription. >> mcdaniel has a prescription for anti-depressants, but the pills shouldn't be in the cell. >> we found a bunch of drugs he should have taken when they were hand given to him. so we know he's been saving them. >> moments later a letter is discovered in mcdaniel's cell. it could shed light on why he was saving his medication. >> hey, mom, how are you doing?