BELLEVUE, Wash. -- King County Prosecutors formally accused a Washington driver, who was allegedly high on marijuana, of striking and killing a motorcyclist in October.

Prosecutors say 33-year-old Caleb Floyd admitted to using marijuana when he hit and killed 23-year-old Blake Gaston of Bellevue on Oct. 4.

Recent blood tests confirmed the belief, and showed Floyd had 9.8 Nanograms of THC in his blood, nearly double the legal limit, according to court documents.

On a personal level, I have seen the troopers, that I work with and myself, have seen an increased level of arrests in marijuana, said Trooper Karim Boukabou, who was on the beat Friday.

A recent AP study concluded in the first six months of 2013, 745 people tested positive for marijuana. Typically, there are about 1,000 positive pot tests on drivers in a full year.

Final numbers are not complete, but Boukabou said he believes numbers have been up since Washington voters approved recreational use of marijuana.

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