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TORONTO, ON: TORONTO, ON - JANUARY, 21 - Yvonne Marchand is a representative plaintiff in $450M lawsuit against Sick Kids Hospital and two employees of its Motherisk lab, over alleged 'inadequate and unreliable' hair testing standards at the lab. (Richard Lautens/Toronto Star via Getty Images)

TORONTO, ON: TORONTO, ON - JANUARY, 21 - Yvonne Marchand is a representative plaintiff in $450M lawsuit against Sick Kids Hospital and two employees of its Motherisk lab, over alleged 'inadequate and unreliable' hair testing standards at the lab.        (Richard Lautens/Toronto Star via Getty Images)