(CNN) Scott Pruitt's resignation as Environmental Protection Agency administrator thwarted multiple investigations into his conduct in office, according to an inspector general report obtained by CNN.

The investigations included: the "Administrator renting a room in a townhouse owned by a lobbyist's wife"; that Pruitt "had subordinates at the EPA assist him in finding personal housing; that he used his official position and EPA staff to seek a 'business opportunity' for his wife with Chick-fil-A, a fast-food restaurant chain; that he enlisted subordinates at the EPA to secure a mattress for his personal use; and that he had his security detail run errands for him."

In each of those cases, "Mr. Pruitt resigned prior to being interviewed by investigators. For that reason, the (EPA Office of the Inspector General) deemed that the result of the investigation was inconclusive. The case will be closed."

In an additional case, investigators found "nothing of investigative merit supporting the allegation" that EPA ethics officials had been pressured into approving Pruitt's lease.

"Investigators interviewed potential victims, who stated that they did not feel pressured into rendering opinions pertaining to the lodging agreement," the report said.

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