[GretchenEE]

Obviously, someone tipped him off to the bugs.

There was an article on FR after the bugs were discovered that said the police do these sweeps routinely since a situation a few (several?) years ago when bugs were discovered in a city official's (mayor's?) office, prior administration. The last routine sweep was in June and no bugs were found.

[aristeides]

That could be true, but it could just as well be a cover story that somebody fed to the press. I suspect the latter.