I wanted to wee when I first arrived at police station. Police made me go to toilet in front of them with no cubicle or door. (This was not a urine sample). They then made me remove my underpants and refused to even look the other way. They later refused to allow me to give them a urine sample? (Now you’ve said this, I’m wondering if they took a urine sample without my knowledge). It is all the same night but separate questions. Also fingerprint and mugshot me. I didn’t even wonder if this is standard procedure when I asked my first question. Then a friend told me it doesn’t seem right. I have long-standing issues of racism with them going back years. Repeatedly stopping car for no reason.
It is standard that a prisoner in custody will be watched constantly. This includes on the toilet. People who are arrested have a habit of hiding evidence on their person and then looking for an opportunity to destroy it, such as flushing it down a toilet or swallowing it. So this all sounds normal.
Yes, being fingerprinted and photographed is completely standard procedure for arrest when a criminal offence is suspected.
The police would not fish your urine out of a toilet to use as evidence, not only is that extreme but it would be contaminated and evidential worthless.
To answer your other thread, I would not recommend a needle phobia defence under your circumstances at all, it has a next to zero chance of success given that you have tattoos and didn't have your needle phobia documented officially before you were arrested. If a lawyer offers to try it for you they're really just robbing you.