The active voice is more understandable and has more impact.

http://mcook.instructure.com/eportfolios/37109/Eq_300_Mg_Rd_For_Sale_By_Owner__Dragon_Pharma__Injectable_Steroids
http://epicentro.instructure.com/eportfolios/1996/TestexC_200_Mg_Alcohol__Pharmaqo_Labs__Injectable_Steroids

縺ゅ縺 メッセージ
Less than half - 46 - said they trusted their favoured news source.