41 CFR 301-2.2: -2.2 Allowable travel expenses.

Agencies may pay only those expenses essential to the transaction of official business as set forth in this chapter. Agencies will not pay for expenses over the reimbursement limits established in this chapter, nor will it pay for circuitous routes, delays, or luxury accommodations or services that are unnecessary or unjustified in the performance of official business. Employees must exercise the same care in incurring expenses that a prudent person would exercise if traveling on personal business.