Peter Pityn of OSHTECH with colleague Ernest A Sullivan at recent professional conference speak out against how public health authorities deal with marijuana grow ops. May 23, 2013/in News /by P Pityn“Dealing With Marijuana Grow Houses: The misguided Canadian Public Health Approach to Assessment and Remediation of Mold”. Presented at the American Industrial Hygiene Conference and Exposition. Montreal, Quebec. May 21, 2013.