Once he's gleaned everything he can, he leaves her head. Instructs the doctors to administer a final dose of amnesia-causing twilight sedation, monitor the humans' health, and arrange for them to wake up hungover back in their hotel room beds.
He goes and thinks for a while. There is definitely something going on here. What he doesn't understand, yet, is what the probably-Andalites (he's putting more than even odds on it by now, this would be a lot of weird coincidences) are hoping to achieve here.
He wants camera surveillance on the housefronts and driveways of all the various rented houses in cities that they've now got listed, but arranged via standard criminal-investigation routes, and without involving Yeerks in cities that don't otherwise have them?
Do any of the houses have telephone lines, or have any of the suspects made purchases of cellular or satellite phones? If so, can they, by saying 'national security' loudly, get them wiretapped without doing anything obvious and visible in their neighbourhoods?