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Knights star Jarrod Mullen will reportedly challenge a four-year ban for allegedly testing positive to drugs.
Mullen was issued with a notice of violation last week for testing positive to Drostanolone, and will attempt to have the ban downgraded, according to News Corp Australia.
"Jarrod had two options -- he could have accepted the four-year ban or taken his case to the tribunal. He has elected to do the latter," a NRL spokesman said.