The 33-year-old Malaysian was temporarily suspended by the BWF on November 11 last year after traces of the banned substance dexamethasone was detected in his system while competing in the World Championship in Copenhagen in August.
"The sanction, imposed by the BWF Doping Hearing Panel, has resulted from an Adverse Analytical Finding of Lee's sample taken at the BWF World Championships last 30 August in Denmark," BWF said in a release.
"Appearing before the BWF Doping Hearing Panel on 11 April, Lee accepted that Dexamethasone was present in his sample and that he had consequently committed an anti-doping violation under regulation 2.1 of the BWF Anti-Doping Regulations (2009)," the release said.
Lee's lawyers argued that "he did so inadvertently and that either no sanction should take place according to Clause 10.5.1, or at least that any sanction should be reduced according to Clause 10.4."
"However, the panel found that Lee had been "negligent", but with the degree of negligence being "rather light" as "he did not realise he had ingested a Specified Substance (Dexamethasone)".
"The Doping Hearing Panel has deemed it "correct and fair" to backdate the period of ineligibility to the date of sample collection, thereby ending his sanction on 30 April, 2015, and making Lee Chong Wei eligible to resume his badminton career on Friday 1 May, 2015," it added.
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