That must be a lot of jewelry
I'd been the guinea pig in all my medschool classes, this includes all non-invasive or minimally invasive tests you can get.
I've gotten nerve conduction tests done on me (same principle as the taser, just affects single muscle groups. You get shocked, all muscles hit by high enough current contract and as long as the current is applied, you're immobilized. Wether you remain immobilized to some extent depends on whether you deplete all the resources (mainly ATP) in the muscle. The issue with tasers is that the heart is also a muscle with well overlapping characteristics with skeletal muscle. Most people die from being tased on the chest and the current inducing arrhythmias that essentially stop the heart.