rapid test = easy?

if your urine test does not have to be sent to a lab, is it easier to cheat on?
i am going to a temp agency that does a rapid test. i am ordering synthetic piss tonight, but i am still worried.
i figure it would be easier to by some fake pee rather than take my chances doing the dilution methood.

i noticed shopping online that it is hard to find some place that can ship quick fix to my state.

If the rapid test doesnt include any validity checks, hot water with added yellow food coloring will pass those. ;)