In an effort to ramp up deportations, federal immigration authorities have a new tactic: arresting people who overstay their visas in airports, according to an immigration memo obtained by ABC News. There have been at least 27 arrests in airports using this tactic, according to a document obtained by ABC News. Rosanna Berardi, a Buffalo-based immigration attorney, told ABC News that ICE has always had the power to arrest someone with a final order of removal or expired immigration status. "ICE is working with TSA and targeting people at check-in counters and gates, sidestepping the warrants and surveillance operations used in the past. On Tuesday, a watchdog group released the memorandum of agreement between the Transportation Security Administration and ICE, which allows for TSA to share information with immigration authorities.