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Toronto police have been called in to help the Federal Bureau of Investigation and U.S. prosecutors in the perjury and steroid investigation case against Major League Baseball great Roger Clemens.

CBC News has learned a Toronto police fraud investigator recently showed up at the headquarters of the Toronto Blue Jays with a court order demanding sensitive team medical records. The detective with the city's downtown 52 Division fraud unit carted away a bankers box filled with evidence.

Clemens is at the centre of a multi-year scandal over doping in Major League Baseball, accused by a number of former teammates and a trainer who claim one of baseball's all-time greatest pitchers used steroids and human growth hormones.

Clemens has repeatedly denied the accusations, including under oath in February 2008 before the U.S. Congress House Committee on Oversight and Government Reform.

"Let me be clear. The answer is no," Clemens testified. "I did not use steroids [or] human growth hormone and I have never done so."

But last month the FBI and U.S. prosecutors charged Clemens with obstruction of Congress, making false statements and two counts of perjury, which carry a maximum penalty of 21 months in prison and fines totalling $1.5 million US.

Clemens has pleaded not guilty.