Edwin may not be able to make the initial meeting, since he's already got some scheming and plots lined up to take care of at the beginning of the rp ;) 
Depends on how long the meeting is, I guess.

Although after his initial business, he'll be straight down to the police station, though likely to simply discuss existing files and what-not regarding the Jagielski Family. I'd imagine the local police and ATF would work somewhat independently, though be available to give each other a hand should it be required.

[i][b]Edit:[/b] For example, ATF will certainly require backup from the local authorities should a raid be planned, or a high-profile arrest be made. On the other hand, local authorities may request information regarding a certain gang or what-not from ATF Intelligence[/i]