Tommy Taxpayer has a problem with keeping records of his travel for business purposes. When filing his taxes, he states that 2/3 of the expenses from his travel were for business purposes and should be deducted. To substantiate his beliefs, he handwrites a document listing all of the mileage and expenses that were incurred over the course of the last year on behalf of the business. He signs and dates the document. Will he likely be successful in substantiating the expenses for the deduction?