[userbinator]

Where is the source for this claim?

The EPA, for one.

https://www.epa.gov/asbestos/protect-your-family-exposures-a...

The problem is inhalation of fibers, so if the fibers are not in the air and inhalable, they pose no risk.

[metaphor]

OSHA also conveniently provides references[1] to various relevant publications by EPA, NIOSH, DHHS, NCI, et al.

[1] https://www.osha.gov/SLTC/asbestos/hazards.html