When flight arrive in CDG from the US are the passengers treated as clean for security, or US arrivals/transfers have to clear security? In some airport like VIE, ZRH all US are treated as cleared and disembark on departures level. Is that maybe the case at CDG?

Does any one know if there are security checks at Hall M - if my US (Delta) flight arrives at M and I have a connecting flight in M can I clear security there?