In the scene when Tommy house gets raided by the authorities he later tells Sincere that it was the Feds that hit his spot the problem with that is they were snitched on by a rival dealer the FBI wouldn't get involved in drug busts that area of crime would fall under the DEA or the local PD Narcotics Unit..
When Roger is offering Tommy a deal, he tells him that, unless he cooperates, he will, "go to jail forever." Jail is where suspects are held before trial or for short sentences, typically less than one year. Prison is where someone would go to serve a longer sentence, especially one lasting "forever." A law enforcement officer, especially a high-ranking one like Roger, would know the difference and not use the terms interchangeably.