The house was surrounded by police who, if they failed to reappear, would not hesitate to break in and make a thorough search.
There were cops all around the house and they are prepared to kick the door down if they didn't show up.
Similarly, with regard to sorbent injection, sorbents other than activated carbon (AC) may ultimately prove to be superior for this application in terms of cost or collection efficiency performance and may reduce the likely demand for ACI from what is projected here.