There is no silver bullet to fighting Iowa's growing methamphetamine epidemic, but a state agency thinks it might have a lock on the problem.

According to the director of the Governor's Office on Drug Control Policy, Marvin Van Haaften, a new anhydrous ammonia tank-lock program has slowed the growth of methamphetamine production.

The locks that will help solve the theft of an ingredient used in the meth process were invented by Dave Christianson of the Tanks-A-Lok, Humboldt.

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