It’s hard for me to be shocked or surprised by anything the US government does nowadays in the name of “homeland security,” but this shocked me: NPR : Electronic Anklets Track Asylum Seekers in U.S.
If you can, listen to the audio segment, which is more detailed than the article. According to the reporter’s concluding statement, if the Department of Homeland Security likes the results of this trial, they’ll consider making all non-citizens wear electronic ankle bracelets.