What secret TFR?
The FAA did issue NTOAM FDC 6/4375 on January 16th, which creates a
moving no-fly zone for drones around DHS facilities and
mobile assets, including ICE vehicles and convoys, that applies wherever they are operating. It prohibits drones from flying within
3,000 ft laterally and 1,000 ft vertically of such assets. This NOTAM moves with the assets and has no fixed boundary or published time limits.
It sucks, but it's 100% public, not secret. You can read it here:
tfrweb
It's not specific to ICE, but applies broadly to the Department of Defence, the Department of Energy, and the Department of Homeland Security.
You could be flying recreationally, 1/2 mile from an activity of the DoD, DoE, or DHS, and could be considered in violation of 6/4375