^
But I was just wondering if it was used in the meth-cooking process.
I was given the same reason for USP boric acid no longer being available.
Thirty plus years ago my daughter(a year or so at the time) was having a serious bout with diaper rash. Expensive Rx didn't work. I remembered my Mom using boric acid for a number of things in my youth so started looking and found "Borofax 10% " worked great! Used it though all my kids diaper years.
When my granddaughter started having a similar issue I found Borofax and all of the generic boric acid containing creams had been discontinued.
Didn't make sense it was drug related as BA is still available as an anti- roach treatment and I've heard meth cookers aren't purity conscience.