Since our investigations are administrative in nature, we cannot seize people's computers, for instance. So we know we are limited. When we make a copy of an email account, for instance, we copy just what was in it on that day. Emails are retained by the agency or the government for just 30 days. So emails could still be recoverable, depending on the date they were deleted.
On February 5th, 2024. See this statement in context.