If you're pregnant but not sure who the father of your baby is, you might turn to a DNA testing company for a prenatal paternity test for some certainty — a company like Viaguard Accu-Metrics, based in the Toronto area. But for years, Viaguard was selling tests that sometimes identified the wrong fathers — and the company's owner knew.

CBC investigative reporter Jorge Barrera walks us through his team's investigation into the company, and some of the expectant parents whose lives were upended by incorrect paternity test results.