The province's anti-corruption squad believes that construction companies with strong ties to the provincial Liberal party diverted materials from an AMT job site to a family member.
In December 2013 UPAC raided the Laval home of Suzanne Bibeau, whose brother Marc used to be a fundraiser for the provincial Liberals.
The Bibeau family owns several construction firms including Shockbeton and Saramac, which are accused of diverting the materials.
CTV News, along with other journalism companies, challenged a publication ban on the documents used to conduct the raids.
Tuesday morning journalists were allowed to see partially redacted copies of the search warrants.
While some details are hidden, it is clear that police are investigating Shockbeton, Saramac, and several other numbered companies all located in the same building at 430 Arthur Sauvé, St. Eustache.
Construction Garnier and Transport Camille Dionne in Laval, along with the AMT are also subject to the search warrant.
The warrant says that Construction Garnier won the $30 million contract from the AMT to build part of the "train de l'est" line to Mascouche, and that it subcontracted cement and concrete work to Schokbeton and Saramac.
Police say Shockbeton and Saramac built prefabricated concrete beams that instead of going toward railway construction were shipped to 473 Les Erables in Laval.
The warrant says the concrete blocks were used to build a patio measuring approximately 13 m x 16 m (40' x 50') around a pool.
The name of the homeowner is redacted, but other sources indicate the home is owned by Suzanne Bibeau.
The Bibeau family was named before the Charbonneau Commission in October 2012, when Lino Zambito said he once gave Pierre Bibeau, a vice-president for Loto Quebec, an envelope with $30,000.
