Seantrel Henderson failed his drug test at the NFL Combined
Henderson failed tests before at Miami, so this doesn't come as a hug surprise. It does, however, say a whole lot about Henderson's intelligence and maturity (or lack thereof).
The NFL Combine doesn't exactly sneak up on anyone. It's planned far in advance, and players know exactly what's going to happen there. Including drug testing. That's a well known fact, and it's pretty embarrassing for Henderson to be unprepared.
That's not even the worst thing that has happened to Henderson in his pre-draft process.
He stopped his pro day workout, apparently saying that he was sick. His Combine performance was sub-par as well.
Coming out of high school, Henderson was one of the biggest prospects in the country. Now, he's looking like he might not get drafted at all. A lot of things change in a few years.