Soma is the brand name of carisoprodol. Carisoprodol has an elimination half-life of between 100 minutes to 2.4 hours, while its primary metabolite, meprobamate, which is also drug-testable in blood or urine, has a much longer elimination half-life of 6 to 17 hours (average is around 10 hours). If you are a regular user or abuser of Soma, carisoprodol and especially its metabolite, meprobamate, will be detectable in the urine drug tests for around 3-4 days, depending on your dosing, frequency, weight, and the test used. Most urine screening drug tests are a 5-panel, looking mainly for THC, opiates, cocaine, methamphetamine, and PCP.
Detection of carisoprodol and meprobamate are usually specialised tests, and confirmed with Mass Spectroscopy / Gas-Chromatography or thin-layer chromatography. I can't speak for all employers and say they will not test for carisoprodol or meprobamate in your circumstance.
Soma is an addictive medication despite the fact that it is not a Schedule I or II Controlled Substance, and its misuse can have life-threatening consequences.
XXXXX XXXXX, MD