quick fix for on the spot testing?

I see a lot of people have success for QF when it is sent to Labcorp or Quest and those companies where it is sent off somewhere. What about tests where they test it on the spot? Does it work when you put it in the cup and as soon as you hand it to them they pour it in the test and wait for the lines there, and are those tests any different than the ones done at a lab?

Synthetic urine will work on any type of test for drugs. It has no drug metabolites to test positive for.