no one cares how you think the laws should be. The laws are the way they are. The police can detain you if they have reasonable suspicion to believe you are involved in a crime in any way
this was 100% legal according to the laws. no one cares what your fantasy interpretation is
TLDR - Please watch the tone of your comments (EDIT: here and in other comments on this topic). Thanks!
""" Be civil. Don't say things you wouldn't say in a face-to-face conversation. Avoid gratuitous negativity.
When disagreeing, please reply to the argument instead of calling names. E.g. "That is idiotic; 1 + 1 is 2, not 3" can be shortened to "1 + 1 is 2, not 3." """
The laws are the way they're written, and the way they're read, and open to discussion and revision on both sides. If you're upset or threatened by that (and I can't see any other reason for some of the gratuitous hostility in your comment), perhaps your position isn't anywhere near as strong as you might like your bluster to communicate, and perhaps it would be better to find some less distressing activity with which to pass time than discuss it on the internet.
> the police can detain you if they have reasonable suspicion to believe you are involved in a crime in any way
This isn't the point of contention at all. That's whether it's reasonable and legal to deny detainees access to a toilet on the basis that they might escape or might destroy evidence.