Fourth Amendment
Force used to take a person into custody is subject to the search and seizure clause. When you use force while taking an arrestee into custody, the reasonableness of the use of force will be a Fourth Amendment issue. Under Fourth Amendment principles, courts will examine (1) the severity of the crime at issue, (2) whether the suspect poses an immediate threat to your safety or the safety of other officers or citizens, and (3) whether he or she is actively resisting arrest or attempting to evade arrest by flight. (Graham v. Connor.)
Therefore, when you have to use force in making an arrest, be sure your arrest report fully details the three Graham factors, and shows why the amount and kind of force you used were appropriate. In Graham v. Connor, the Supreme Court cautioned lower courts about the tendency to second-guess officers: "The reasonableness of a particular use of force is to be judged from the perspective of a reasonable officer on the scene, rather than with the 20/20 vision of hindsight. Not every push or shove, even if it may later seem unnecessary in the peace of a judge's chambers, violates the Fourth Amendment. The calculus of reasonableness must embody allowance for the fact that police officers are often forced to make split-second judgments- in circumstances that are tense, uncertain, and rapidly evolving-about the amount of force that is necessary in a particular situation."
Also, the court held that use-of-force assessments are not to be based on an inquiry into your subjective beliefs about the situation you confronted, but are to be measured objectively, based on conclusions about how a reasonable officer in your position would have reacted. "The question is whether the officers' actions are 'objectively reasonable' in light of the facts and circumstances confronting them, without regard to their underlying intent or motivation," said the court.
It's also important to keep in mind that the issue is not whether force was necessary, but whether it was reasonable. It might turn out in retrospect that force would not have been necessary, but if it reasonably appeared to be the prudent thing to do at the time, the force is not excessive. Therefore, instead of describing your actions in a report by saying "necessary force was used," it would be more appropriate to say, "reasonable force was used."