ABC Company has three in-house salespeople (Red, White, and Blue) who all make frequent trips to Santa Fe, New Mexico, where one of the company's largest customers is based. A manager at ABC has noticed that the average airfare expense claimed by Red for these trips is $755 round trip. The average airfare expense claimed by White is $778. The average airfare expense claimed by Blue is $1,159. What type of expense reimbursement fraud might this indicate, and what controls would you recommend to the company to prevent this kind of scheme?