How long does it take for cocain to clear to pass a urine test?

I f some one used cocain on 2days ago will they pas a urine drug screen?How long does it take for cocain to clear to pass a urine test?
72 hoursHow long does it take for cocain to clear to pass a urine test?
I've heard from a friend who is familiar with drug testing that it takes 3 days if you douse yourself in plenty of liquids...
I hope not. this conversation should be about how you can live clean, not just clean up to pass a test.