Hydrogen peroxide would be detectable. Just inject them with air. Your blood stream is an airtight system and by injecting air, it will look like a heart attack. Therefore, they will have no reason to look for the injection site because according to them, there will not be one.
Well.. You would have to inject a whole lot of air. Not a tiny buble you see in movies. My father is a anesthesiologist, and I wondered about this my self.
You would need a good amount of air to cause problems.
You would need a good amount of air to cause problems.
GOOD LUCK