GREEN BAY, Wis. (AP) — One expert says Wisconsin's growing number of heroin cases now could signal a problem with methamphetamine in the future. An expert who spoke in Green Bay on Wednesday says spikes in the number of heroin cases are often followed by spikes in meth cases. Currie Myers is a former drug agent with the Kansas Bureau of Investigation. He says meth is less expensive than heroin and often easier to obtain. He says meth has also become popular with motorcycle gangs and others seeking a high from a drug they might be able to manufacture themselves. Myers notes that the Wisconsin Department of Justice has seen an 86 percent increase in meth arrests from 2011 to 2012, a sign the drug is gaining in popularity.