Sam Hamad denies he used the offices of an engineering firm for campaigning purposes.
The MNA's name was mentioned Friday during testimony at the Charbonneau commission.
A former VP with Roche engineering told the inquiry that in the last 10 years Quebec engineering firms were regularly approached for monetary donations from virtually every municipal, provincial and federal political party.
Andre Coté also said former and current Liberal cabinet minister Sam Hamad boroughed office space from him before the 2008 election.
Hamad, who's currrently the Quebec Labour minister, once worked for Roche.
He was Transport minister under premier Jean Charest.
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