Stop Meth Labs and Enhance Patient Access Act of 2014 - Amends the Controlled Substances Act to authorize the Attorney General to exempt a scheduled listed chemical product from specified requirements regarding sales quantity, nonliquid forms, and retail transactions upon determining that it is not practical by processes known to be employed by clandestine laboratory operators to use the product in the illicit manufacture of methamphetamine (currently, upon determining that the product cannot be used in the illicit manufacture of methamphetamine).