A tipster told the ABC11 I-Team that the non-profit group just wrapped up its first summer tour, and claimed a registered sex offender went along.
Parents say an email alerted them that the man they'd come to know as Chris Weaver - the assistant corps director - is really Timothy C. Weaver. He's a former Forsyth County Teacher convicted in 2005 for having sex with a teenage student.
"I'm just so thankful I didn't send my child on the tour - just feel bad for parents on the tour," said one parent.
A former staff member spoke with ABC11 anonymously.
"I was pretty shocked. I would've hoped he wouldn't have hired someone like that knowing that was their prior history," said the person.
Weaver laid out his history to parents and staff members in an email after ABC11 started asking questions.
"I made a mistake. It changed my life. By no means am I proud of what I did. All I wanted to do was get back into the field of music to which I love," he said.
As for the students Weaver toured with, he goes on to say:
"I know your concern is safety. In no way are they, or ever were, in danger."
He says his job was mostly administrative, so he took a hands off approach. If that's true, Weaver may have avoided violating the law that forbids registered sex offenders from instructing, supervising or caring for a minor.
"But I still wouldn't have felt comfortable with my kids working with him at all," said the former staff member.
Platinum's executive director told ABC11 the staffer responsible for doing background checks failed to do so and was fired.
He also said Weaver was dismissed a while ago and did not travel with the drum corps.
But, we found a Facebook comment from Weaver about the corps' recent out of state performance dated July 20.
Wednesday, Weaver was no longer listed on the group's website. Tuesday, he was listed among the corps top organizers.
In his email, Weaver tells parents he'll no longer be listed on the sex offender registry as of 2014. We've learned he completed his five years of probation last January.
Still, that's of little comfort to some.
"I just feel very bad that I wasn't made aware of this situation," said the parent.