The current density is easy to compensate for. The simplest way is to use resistors but that does not match the body well so the best way is to make a parallel connection to a body from the slide.
The second step is doing the experiment on a gallon of pond water that weighs close to 8 pounds and then a 20 gallon tub of water that weighs approx 160 pounds.
Yep, works just fine in a human sized body of water.
Last step. Enough solid evidence to support the claims so that the FDA was not able to prosecute a "false claims" case or a case of fraud either.
The FDA found that data so convincing that ( when sold for use on humans ) they considered ParaZapper to be a Class III device rather than a class 1 or Class 2 that some claimed. This is according to our attorneys.