DENVER (KDVR) — An investigation has been launched in Denver after election officials found ballot irregularities tied to an adult daycare center in the city. The Denver District Attorney's Office is investigating, while counties and law enforcement in the Denver metro are also investigating the situation as well. Denver Clerk and Recorder Paul Lopez said his office discovered the irregularities. ‘At least 12’ ballots stolen, voted fraudulently in Mesa County Lopez said several voter signatures had discrepancies, all associated with the same address. "This incident demonstrates how Colorado's multi-layered ballot processing systems have been proven effective in identifying irregularities in voted ballots, assuring voters Colorado elections are safe and accurate," the Denver clerk's office said in a statement. All mail-in ballots in the state undergo a signature verification process. This is when ballots are looked at to make sure the signature on them matches the one included in the voter's registration. According to the Denver clerk's office, election fraud involving voter impersonation is punishable by up to 18 months in prison, a fine of up to $5,000 or both. This is not the first investigation into voter fraud launched in the state this election season. Colorado Secretary of State Jena Griswold announced on Oct. 24 that at least a dozen mail-in ballots in Mesa County were intercepted and sent in without the knowledge of the actual voters. The investigation into that incident was ongoing as well.