The two are being investigated via their airplane leasing business in Florida, after DEA agents have been given evidence that they are providing aircraft to South American drug traffickers.
Don and Bill Whittington raced during the late 70s and early 80s, and won the 1979 24 Hours of Le Mans in a Porsche 935 K3.
Later, the bothers pleaded guilty to their involvement in a massive Marijuana smuggling ring that financed their racing careers both in America and abroad, and served jail time in 1987.
Today, World Jet Inc is being investigated for illegally providing aircraft to cocaine cartels and laundering the proceeds through a resort and ranch in Colorado.
The DEA says, World Jet leases or sells aircraft to drug traffickers in Colombia, Venezuela, Mexico and Africa at a hefty price, keeping the plane under the Whittington name or that of a third party and maintaining a U.S. tail number.
Earlier this year is it suspected that a confiscated Hawker 700, seized by the Venezuelan government was able to move up to two tons worth of contraband.
The duo not only spent time in Le Mans, but ran select NASCAR races and even Indy 500s, with the best result coming in 1982, with Don finishing 6th.