Your answer pertains to the standard urine NIDA 5 tests. Those indeed may miss demerol and fentanyl in particular, though may give a positive, general qualitative opioid result. The question relates to standard hair follicle testing and subsequent confirmatory testing. Will (1) basic hair follicle testing result in a qualitative positive opiod result, and (b) will such a positive trigger a GS/MS confirmation test, result in testing for metabolites of demerol and fentanyl as opposed to only the ones you mentioned?
The specific lab in question is: OMEGA Laboratories' hair follicle testing. After reviewing their brief on-line info (simply google Omega Laboratoties), what is your best guess / analysis?