why, when surgeons decide to leave in a bullet does the body not try to expunge it or form pus as it does a splinter say
a copper jacketed bullet that does not fragmet poses little if any threat to the body as a foreign object, copper is not poisonous. If no cloth is caught up with it and no lead is exposed, you can live the rest of your life with it in you. Organic matter like cloth, wood and the like are biodegradeable and therefor a threat so the body tries to exponge such with great effort, the resulting supporation is what can kill you with septicemia. Bullets left in the body are usually left because surgury is too invasive or dangerous for extraction to be possible. Rare, but it happens. Makes life hell for NTSB folks at airports.