I use far far less if I use a very small amount twice rather than a lot once. The shampoo will mix with oils in your hair and when you wash once you just keep rubbing the oil and detergent mix back onto yourself. Using a small amount and rinsing it off will make it function far better.
There is also the legality of it and if it is treasonous. The one person at least the senators have some saftey nets from the Supreme Court but they still are at risk here.