Police, what happens if you need a toilet during a riot?

Policeman here! Generally, we get very good at controlling our bladders, just like a range of other careers. We are often need to sit doing the same thing for 10 hours at a time, and we've all been on the way back to the station to have a wee then been diverted to an emergency - so you learn to control it as much as humanly possible. There are, of course, time when you really REALLY need to go. Each line of riot cops *should* have a couple of similar lines of riot cops about 50/100 metres behind them and they *should* rotate every so often depending on the intensity of the front line. When you're the rear line, you jump back in your carrier and your entire team will drive to the nearest McDonalds/Tesco/police station to use the toilet and grab a brew/food - and inevitably get remarks from people like 'don't you have better places to be?'. You will try to pee on every break you get in order to avoid needing to go at the wrong time. Are there times where you don't get rotated and get stuck in the line for ages? Yes. But usually only in prolonged periods of serious disorder (molotov cocktails, weapons, attempts to breach the line, etc) and so your mind focuses on other things. If you really need a pee then, I don't think anyone will blame you for leaving the line, peeing round the corner on the street, and getting straight back in. This would be very difficult (especially for ladies) as you will be wearing boxers, flameproof leggings, possibly sports shorts, a cricket box, and then the blue overall. That thought alone makes me think I can hold it a big longer.