When arresting someone, you have to read their rights on the scene or on the way to a police station. The correct rights to read are as follows:
"The time is now. ___ you are under arrest on suspicion of ___. You do not have to say anything. But it may harm your defence if you do not mention when questioned something which you later rely on in court. Anything you do say may be given in evidence. You have the right to food, water, medical attention and a lawyer."
You should be searching the suspect at the scene of the arrest, immediately seizing any illegal possessions the suspect may have, as well as handing the evidence bag into the evidence room at the station you go to. Any illegal possession should be added as an additional charge. Once any items have been seized, you should then transport them to a police station and begin processing them.
After they are at a police station, take them down to the holding cells, where you will take their ID out of their back pocket. After you get it, get the PNC out by doing F7 or /PNC, and press on Person Search, and then look to the right under their name and press Search. The person's name will come up in the middle; press on that, and then you can go over and press on New Offences, where you can go through and add all the charges and tell them the fine and time they are looking at. If they want a lawyer, then let them out of cuffs and inform them that they have 10 minutes to get out and in a suit and tie, or their right to a lawyer will be denied. After the lawyer sits, take them back to a cell to put the thorugh agreed fine and time.
When detaining someone, you need to have a valid reason, like they search a bag at an active scene or try to impedea police investigation. If it is something like those, then you are allowed to cuff the people and remove them from the scene. If it is that they have searched a bag from an active scene, then you are allowed to search them and take any items that they have taken from the scene.
Down below you can see the arresting procedure.
Credit to Hendry & Teejay for helping