Your reading comprehension is horrible, to say the least. Let me highlight the keywords for you so it's easier.
Most courts have ruled that mandatory urinalysis, at least in the absence of probable cause or reasonable suspicion, is invalid as a violation of the Fourth Amendment.
Huh??? "Bound by the fourth amendment?" Have you ever read the Constitution? The fourth amendment protects you against unlawful search and seizure. As in, a protection afforded to all Americans. Please read a little.
https://constitutioncenter.org/the-constitution/amendments