A 31-year-old guy named Shaun Miller from Hyannis, Massachusetts was indicted on heroin trafficking charges in April and has been on the run from the cops ever since.

Why haven't they been able to catch him?  Well, because Shaun has been hiding in plain sight by disguising himself as an old man!

No, seriously, he's been wearing a mask equipped with fake gray facial hair, aged skin, and liver spots whenever he leaves his home!

Unfortunately for Shaun, the cops figured it out.

He walked outside in his mask, and at first the cops thought it really WAS an old man . . . but then they realized it was Shaun and arrested him.

He'll be locked up until a hearing next week.

For more, CLICK HERE.