Investigation
By late June 1967, the Royal Canadian Mounted Police (RCMP) had taken an interest in Michalak's claims. They could not identify the site on their own, and on June 1 they brought Michalak with them. However, Michalak could not locate the site, which raised further doubts regarding his claim. The RCMP also confirmed that Michalak had consumed multiple bottles of beer the night before the sighting.
By June 26, Michalak had located the site and recovered personal belongings he had left there. The RCMP obtained soil samples from the location, which they tested for radioactivity. The tests were negative.
On July 28, Michalak and RCMP officers together identified a semicircle on the rock face at the scene, 15 feet in diameter, where the moss had been somehow removed. There were traces of radiation in a fault in the rock across the center of the landing spot. No trace of radiation was found around the outer perimeter of the circle or in the moss or grass below the raised portion of the rock.
The radioactive material found in the rock fault was radium 226, a naturally occurring isotope in wide commercial use and also found in nuclear reactor waste. They concluded that the level of radiation posed no danger to humans in the area.
Michalak died in 1999, age 83.
Read more about this topic: Falcon Lake Incident