The EPA also swept for bugs in Pruitt's office and installed biometric locks on his office doors, at a cost of approximately $9,000. In September 2017, it was reported that Pruitt's security detail had increased to 18 people who guarded him around the clock, which was without precedent in size for an EPA chief. Additional agents for Pruitt's security detail were reassigned from the EPA's Criminal Investigation Division, which more typically investigates environmental crimes. The EPA justified the size of the detail, saying that it was because Pruitt faced greater security threats. However, an internal EPA report showed that EPA intelligence officials concluded there was no justification for the expansion of Pruitt's security detail and that there were no specific credible security threats against Pruitt; the career EPA official who approved the report was later dismissed. The Associated Press failed to find any case where someone had been charged or arrested for threatening Pruitt. In October 2017, CNN reported that Pruitt had requested a dozen more agents, which would cost the taxpayers at least $2 million per year in salaries alone. By June 2018, the costs of Pruitt security was more than $4.6 million.