A Boyertown man has admitted having sex with an underage girl in Perkiomen Township. 48-year-old Dwayne Maurer, who also gave an East Greenville address, pleaded guilty Tuesday in Montgomery County Court. He remains in county prison without bail, and the Pennsylvania Sexual Offender Assessment Board must review the case before sentencing to determine whether he is a sexually violent predator under Megan’s Law. Regardless of the panel’s finding, he must report his whereabouts to state police for the rest of his life after he is released from prison. A background investigation will include a drug and alcohol evaluation. The girl said Maurer was using marijuana and blowing the smoke into her face, trying to get her to smoke it, at the time of the assaults. She was under the age of 13 when two incidents occurred between 2002 and 2007, and police started investigating after she told her psychologist about the abuse.