In 1996, Michael Beck and a colleague at the National Security Agency were sent to a "hostile country" on a brief assignment. After being detained at the airport for about an hour, they were allowed to go, but they knew they were being closely watched.
A few days into the assignment, Beck woke up at his hotel feeling terrible.
"It was extreme fatigue and weakness. I was a bowl of jelly and couldn't get moving," said Beck. He was suspicious of the cause, but the symptoms went away.