I saw footage of someone being arrested by the police. How do I subdue or arrest an enemy? Can only the police team do this?
You need a blunt weapon (anyone can do it)
Hit the enemy from behind (with the blunt weapon) -
Profit - Interrogate him (press
Eon the downed enemy - it will show all of them on the minimap)
Source and list of Blunt Weapons - http://battlefield.wikia.com/wiki/Blunt_Weapon
Video performing some takedown/interrogation -(pt-br but you can see the HUD with the buttons)