Four days after her suspension was lifted, Claressa Shields is feeling fully vindicated.

The unbeaten, undisputed heavyweight champion posted a letter on Tuesday from the bureau that oversees boxing in her home state of Michigan, declaring that her positive test for marijuana following her decision win over Danielle Perkins last month was the result of “a procedural error.”

“The above referenced complaint file opened against Respondent Claressa M. Shields has been closed with no disciplinary action taken following receipt of additional evidence that a procedural error occurred during the collection of Respondent's oral fluid specimen,” reads the statement from the Securities and Commercial Licensing Bureau, which oversees the Michigan Unarmed Combat Commission.

“I’m officially cleared!” the two-time Olympic gold medalist Shields, 16-0 (3 KOs), wrote on the social media platform X after receiving the letter.

Shields, who has won world titles in four divisions, from 154lbs up to heavyweight, dropped the previously unbeaten Perkins in the final round of their ten-round bout on February 2, winning a unanimous decision at Dort Financial Center in her hometown of Flint, Michigan.

An email to Shields' lawyer, David Slutsker, was not responded to at the time of this story's publication. 

Slutsker, whose offices are located in Boynton Beach, Florida, where Shields now lives and trains, told USA Today that a swab used in collecting the sample had broken in Shields’ mouth, and was placed on a “possibly contaminated towel randomly lying on the testing table before being placed in the vial.”

Slutsker also suggested that her test could have been contaminated by secondhand smoke, adding that she was tested in the “aroma filled hallway” of the arena.

Promoter Dmitriy Salita expressed his excitement about his star fighter being able to put this ordeal behind her.

“[Claressa Shields] has been cleared, proving once again she’s a clean athlete with unmatched discipline and integrity. Now, it’s on to bigger and better opportunities!” wrote Salita.