Are detox patches a scam?

Do foot detox patches actually absorb toxins from the body or is this just another scam? Could it be just the sweat from the feet that make the patches go brown and sticky and not toxins? Anyone else got any thoughts on this as I have heard also that the footbaths mucky colour is due to rust with some folk suggesting the water goes a browny colour without even putting there feet in.. are we all getting punked? Tweet