SPRINGFIELD — A man who eluded authorities for nearly two decades after a drug conviction caught a small break at the state’s top court this week.Illinois’ highest justices have ruled Fernando Casas Jr. can’t be charged with violating his bail bond after he failed to show up in court on cocaine charges in 1998.Casas was apprehended in April 2014 during a traffic stop in DuPage County, admitting that he had used false identities to remain on the lam for 16 years. He subsequently began serving the 20 …