A Suffolk County sheriff’s deputy in Massachusetts has been arraigned on charges of human trafficking and child sexual abuse after prosecutors alleged he groomed and paid a 15-year-old boy he met through an online app for sex over a six-month period. Authorities say the case was uncovered after the teenager’s parents discovered an unfamiliar phone and raised concerns, prompting an investigation that led to the arrest of Richard Kielczewski, 41, who is now being held without bail.