I mean treat these as you would any media exposed to microbes - inoculated by intent or otherwise. Whereas this is unlikely to run afoul of fed regulatory attention unless you're regulated by FDA, many state EPA's regulate disposal of hazardous (including biological wastes) and would likely find this practice in violation.
This is a pretty cavalier disregard for safe practices.
Let me ask one more - how do you dispose of inoculated plates that showed no apparent growth?
To your question, i suggest you clearly communicate your concern. No one knows what's growing on the plates. In any case, have your management document the practice they demand by SOP. Folks may be less cavalier when they have their name associated with a questionable practice.
Here's the OSHA lab standard for info: https://www.osha.gov...ty-guidance.pdf
You'll read - "Employers may use the list below as a starting point for technical and regulatory information about some of the most virulent and prevalent biological agents and toxins"
Included in that list is the relevant comment - "Molds and Fungi. Molds and fungi produce and release millions of spores small enough to be air-,water-, or insect-borne which may have negative effects on human health including, allergic reactions, asthma, and other respiratory problems."
Not that OSHA is esp. smart (molds ARE fungi) but this caution is relevant to your concern.
Edited by Phil Geis, 21 March 2014 - 05:10 AM.