Enlarge (credit: Getty Images | picture alliance ) Google defended its use of "history-off chats" for many internal communications, denying the US government's allegation that it intentionally destroyed evidence needed in an antitrust case. The history-off setting causes messages to be automatically deleted within 24 hours. The US government and 21 states last month asked a court to sanction Google for allegedly using the auto-delete function on chats to destroy evidence and accused Google of falsely telling the government that it suspended its auto-deletion practices on chats subject to a legal hold.