I have an AMEX card. It was issued to me by my employer. If anyone tries to use the account, I would immediately get an e-mail from corporate, demanding that I fill out an expense report.
Irritating, but effective.
American Express is the only card I will use. It’s not a credit card. It is a charge card which is to be paid in full each month. Every charge is text messaged to my smart phone simultaneously as it is made. Great customer service too.