At least two legislators have said they plan to introduce similar bills during the upcoming legislative session.
If West Virginia passed a pseudoephedrine prescription law, other states likely would follow, Humphreys predicted.
"If one state passes it," he said, "the incentive for other states would go up."
A mental-health advocate who attended Wednesday's conference questioned whether criminals would "doctor shop" and obtain pseudoephedrine for non-medical reasons like they do with prescription painkillers in West Virginia.
Humphreys said that isn't likely to happen.
"It's very easy to fake pain," he said. "It's hard to fake a stuffy nose."
Humphreys praised other parts of Tomblin's substance-abuse bill. He said the new law strengthens West Virginia's prescription monitoring program, which spotlights suspicious prescribing practices. The bill also increases training for physicians who write prescriptions for controlled substances. Those steps reduce prescription drug abuse, Humphreys said.
"There are some good policies in the new law," he said.
Humphreys said the law should be expanded to allow first responders -- police officers and firefighters -- to administer a drug called naloxone to people who overdose on painkillers. West Virginia has one of the nation's highest drug-overdose death rates.
"This is a way to save lives," Humphreys said.
He also suggested that West Virginia "lock in" Medicaid recipients to a single doctor or health-care provider to prevent "doctor shopping" for narcotics.
Reach Eric Eyre at erice...@wvgazette.com or 304-348-4869.