Is there a certain type of job/industry that would be more inclined to use a lower cutoff?
Again, it depends on the employer and how much money the employer wishes to spend. The only exception to this if its a DOT-regulated test. Under DOT regulations (in which employers in participation must follow), ALL DOT-regulated tests utilize an Immunoassay (for the initial screen) with a 50 ng/ml cutoff for THC. If the urine sample fails the I/A, the sample undergoes the GC/MS (for the confirmation test) which carries a 15 ng/ml limit for THC.