How long does Watson 385 stay in your system?

One of my friends took a couple of those pills two days before a pre employment drug screen (swab test) failed with flying colors same friend did cocaine a day before a pre employment test another swab test and fail again and said he took a waton for Back pain and they had told him that watons on a drug screen will come out as cocaine positive my guess and its a good guess that one waton will stay in your system for three very whole days if you took more I'd say no more than 5 days and try to sweat them out might be sooner but this is for a swab or urine test not hair or blood . Hair and blood should be at least 3 months hope that helps