Yet people still cut off the wrong bits, leave things inside. Read this is you want to get mad: https://www.nj.com/hobokennow/2008/06/humc_suspends_doc_who_...

The doctor who did this is still practicing last I checked, as are the staff involved in covering it up, and the hospital he worked for was not informing patients of his history.

Another shockingly similar case: https://www.deseretnews.com/article/412903/HOSPITAL-SETTLES-...

Just two cases I remember reading about. Over a quarter million or more per year according to most sources.

Medical mistakes are the THIRD leading cause of death in the USA. Actually, conscientiously using a checklist to reduce that isn't too much to ask.