The number of methamphetamine labs busted in Iowa has taken a fall — 428 labs were found during the first nine months of the year, compared to more than 800 in all of last year. One state law enforcement official says the drop in meth lab discoveries was expected as other agencies respond to meth labs and don’t report them to state officials..Jerry Nelson is Special Agent in Charge of the Iowa Division of Narcotics Enforcement. He says a seasonal shift is about to begin as far as where meth is being made in Iowa. The labs will be moved inside as the weather gets colder.Statistics show the number of meth-related arrests has more than doubled in the past five years. Agent Nelson says it’s good that meth makers and dealers are being caught, but they’re not being kept off the streets for very long because of prison overcrowding. Nelson hopes state legislators will consider the continued meth problem when they reconvene in January.Nelson says the average meth convict only serves 18 months of a ten-year sentence.