I heard a story about Nixon’s secret service detail when he was out of the White House and living in New Jersey.
A technician was doing work on the house’s alarm systems and was having a lot of interaction with the secret service agents.
His conclusion was that they were all high as a kite.
Nixon voluntarily gave up SS protection at some point after he left office and was living in California. He paid for his own security which consisted of one person who traveled with him.