 On October 17, 2011, an Ohio law banning synthetic drugs took effect barring selling and/or possession of "any material, compound, mixture, or preparation that contains any quantity of the following substances having a stimulant effect on the central nervous system, including their salts, isomers, and salts of isomers", listing ephedrine and pyrovalerone.It also specifically includes MDPV, misspelling the full name as "methyenedioxypyrovalerone".Four days after this Ohio law was passed, the DEA's national emergency ban was implemented.