Sister in law + her family just moved down to Phoenix. They came back up to denver to visit for a couple weeks. Since they were traveling from out of state, and were planning to visit some older family members during their visit, they decided to swing by the free Covid testing going on at the pepsi center. They filled out the data online, then arrived at the pepsi center, got checked in, then were told it would be 4+ hours before they could be tested, so they left without getting tested. The next day, they received notification from the testing place saying they tested positive, and that they needed to quarantine for 2 weeks. They explained that they were never tested, and told "well, you still need to quarantine". They are a family of 4, all being reported as positive for covid, who were never actually tested and have no symptoms of anything.

My wife's co-worker apparently relayed an almost identical experience, getting told they tested positive even though they hadn't completed a covid test.

So either the testing is completely bogus, or it's run by really incompetent people, or they've using some new psychic testing method.