Agents say it's one of the biggest bust they made in a while.
They seized 4 pounds of heroin from a 49-year-old man from Ghanaian.
He arrived on a Delta flight from the Netherlands at Detroit Metro Airport.
The estimated street value of the drugs is $400,000.
Agents says the man was acting strange.
"The gentleman exhibited tell-tale signs of nervousness our officers are trained to pick up on body language, " said Devin Chamberlain CBP Port Director.
When agents stopped the man they examined his belongings and a package containing the heroin was found.
"The relentless efforts and dedication of frontline CBP employees has resulted in the interdiction of these illicit drugs, preventing them from reaching the streets and doing harm," said Chamberlain
The suspect was arrested and turned over to U.S. Homeland Security.
The U.S. Attorney's office says they will be prosecuting the individual.
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