That's pretty simple. First you open the editor. You will find it here: "Start"-"Program"-"Sixteen tons entertainment"-"Emergency 4"-"Emergency 4 Editor". When the editor is loaded go to modification and load LA Mod from there, wait until it's done. There will be a menu on the side now, go to persons (I think), then LAPD or police, find the officer you want to be able to give first aid. Click on the officer, then on the "Edit" button. A new menu shows, press "Edit commands", then on the left menu scroll down to either "Heal" or "Pmcd Stabilize". Click on the one you want and press the arrow that points right to add the command, press ok when your done. Now the police officer can give first aid. PS: The "Heal" command will give the officer the same type of bag as the paramedics, the other command are the same type as the fire fighters use.