sticky mats
... that proper use of engineering controls should prevent contaminants from being excessively deposited on sticky mats at a laboratory's exits?
... that proper use of <a href="./Engineering_controls" id="mwArE" rel="mw:WikiLink" title="Engineering controls">engineering controls</a> should <a href="./Contamination_control" id="mwArI" rel="mw:WikiLink" title="Contamination control">prevent contaminants</a> from being excessively deposited on <b id="mwArM"><a href="./Sticky_mat" id="mwArQ" rel="mw:WikiLink" title="Sticky mat">sticky mats</a></b> at a laboratory's exits?