Efficiency of extraction and conversion of pseudoephedrine to methamphetamine from tamper-resistant and non-tamper-resistant formulations.

•Assess extraction efficiency of pseudoephedrine from claimed tamper resistant products.•Compare meth yields from claimed tamper resistant and non-tamper resistant products.•Meth was produced readily from pseudoephedrine products using clandestine methods.•Meth yields were similar for claimed tamper and non-tamper resistant pseudoephedrine products.