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A Canadian DNA laboratory knowingly delivered prenatal paternity test results that routinely identified the wrong biological fathers — ruling out the real dads — and left a trail of shattered lives around the globe, a CBC News investigation has found.

Harvey Tenenbaum, the owner of Viaguard Accu-Metrics, told a CBC producer with a hidden camera during a conversation in his office that prenatal paternity test results that his laboratory produced for about a decade were "never that accurate."

The hidden camera conversation unfolded in the midst of a months-long CBC News investigation into a years-long pattern of erroneous results produced by Viaguard's non-invasive prenatal paternity testing. The test — if done correctly — matches DNA from a fetus that is in a mother's blood with the biological father's DNA.

Viaguard, based in Toronto, sold its prenatal tests through various related online storefronts with names like Prenatal Paternities Inc. and Paternity Depot.

"The test was not that accurate…. And we're leery of that test now," said Tenenbaum.

Tenenbaum is 91 and still runs the laboratory, showing up onsite most...