Hundreds of construction workers could be turning up to worksites unqualified after a Sydney man was arrested for selling fake health and safety white cards, police have warned.

The man from Sydney’s northwest was arrested on Tuesday for allegedly selling at least 400 cards to unqualified workers. Police say the 37-year-old Kellyville man completed online white card training falsely claiming to be someone else before providing the white cards to people for a fee. He is set to…