Ionic Detox Footbaths

How can so many people be so gullible?My dtr in law( has Masters degree) comes over the other day raving about these footbaths some teacher friends of her’s told her about.$40.00/30 minutes.”.Water turned brown removing all the toxins out of her body,how good she felt being detoxed” I explained to her it was a big scam,all her healthy feelings were placebo effect.She kinda got in a snit,my wife even got mad at me.Said it was her money and if she wanted to waste it ,it was her business.
I look it up on the internet and there are these ripoff “spas” all over Louisiana.Seems like it would be outlawed.
Anyone not familiar with it,there is an iron anode in a saline’s solution with weak electrical current,causes accelerated rusting and the water turns brown,even with no feet in it.