You can buy written "honesty" tests. The tests:

• are generally multiple choice or true/false
• vary greatly in quality
• are controversial (Are people really "honest" or "dishonest" or do they react to circumstances? Can "honesty" be measured?)
• can sometimes be second-guessed by the applicant, meaning that they can give the "right" answers rather than the answers that truly reflect their responses
• are not medical exams, even though they determine personality characteristics and may be offered at the pre-job offer stage

Probably the more accurate method of gauging an applicant's honesty is to conduct a background check and to compare whether the application form contained correct information.