A federal court agreed, ruling that agents can't rely on factors such as race, speaking Spanish, wearing workman-like clothes, and location [...] to meet the standard of "individualized suspicion."
But in September, the Supreme Court paused that previous ruling, saying immigration agents can use those factors as reasonable suspicion to stop someone. (Legal proceedings continue on this case, however.)
Like, even under this awful terrible and completely unimaginable ruling (Which should not be the legal standard in the US), there is no way that ICE could be considered to have the power to detain this person.