There are two types of warrants being talked about here, traditional judge signed warrants and "administrative"/"ICE" warrants. The first one carries the ability to perform a search and possible detainment subject to the 4th amendment protections, the latter allows for discretion under the 4th amendment (this may be an viewed as an unconstitutional search) the Judge exercised their discretion with respect for constitutional rights.

It's a sad day in America when people do actually enforce the rules get trapped by other rules.