Probation was reinstated Monday for a 32-year-old man who owes nearly $50,000 in back child support after he admitted using methamphetamine and heroin.District Judge Michael Gibbons ordered Mark Duncan to successfully complete Western Regional Drug Court as part of his reinstated probation. If he fails, Duncan faces prison.He also ordered Duncan to serve 25 days in Douglas County Jail with credit for time served. Duncan was taken into custody Oct. 3 for the probation violation.Duncan was sentenced in April to five years probation and ordered to pay child support at a rate of $257 per month.He told Gibbons on Monday …