[alksjdalkj]

There's a whole list of LEAs here: https://en.wikipedia.org/wiki/Federal_law_enforcement_in_the.... I guess laws that are specific to just one department of the executive branch have to be enforced by the corresponding LEA from that department?

[ncmncm]

They can all arrest for any federal violation. But their investigative responsibilities are divided. In many states they can also arrest for non-federal violations, but must deliver the arrested to local authority.