If they are using cement production plants for the purposes of disposing of criminal evidence such as incinerating human remains from human trafficking in the kilns, then this could also be done under the cover of "Hazardous Bio-Waste" where sealed containers of victims remains are delivered looking like hospital "Bio-Hazard" then input into the kilns and incinerated without anyone knowing those were actually human remains and criminal evidence. If cement production kilns burn that hot then even DNA evidence would literally be turned to ash. This should be investigated. Crematoriums hiding in plain sight.