Denying reimbursement when employees violate travel expense policies is an option that some think sensible and others call draconian. But plenty use it. In a September 2014 Global Business Travel Association poll, 45 percent of North American and 31 percent of European travel managers indicated non-reimbursement was a consequence of travel policy violations at their organizations.

Non-reimbursement policies are often empty threats, but they're especially hollow in California, where enforcing them would be illegal. The state's law covers business travel expenses, including those related to use of company or personal vehicles . . .

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