The Minnesota Pollution Agency says its investigation of deformed frogs has become too big to handle. Deformed frogs have been reported across Minnesota, in neighboring states, and as far away as Vermont. The MPCA plans to turn much of the research over to federal agencies better equipped to handle the deepening mystery. Minnesota Public Radio's Mary Losure reports. The Minnesota Pollution Control Agency first began looking into the problem in the summer of 1995, when a group of schoolchildren on a fei