Sure, the indications for using it can be clarified. EMS would go for chemical restraint (i.e. ketamine) for someone where "excited delirium" is suspected. This doesn't mean literally anyone being ornery with the police - and generally we aren't even involved in those calls. A person in a normal state of mind won't break their arms or dislocate their shoulders when they're put in handcuffs. Someone who took too much meth very easily could.