Pre-Chiropractic Studies: Agreements & Early Admission Programs Truman has special agreements with prominent chiropractic colleges that shorten the time it takes for you to achieve both a bachelor’s degree and a doctor of chiropractic degree. 3+3 with Logan College of Chiropractic & Truman Biology Majors 3+3 with Logan College of Chiropractic & Truman Exercise Science Majors 3+3 with Logan College of Chiropractic & Truman Health Science Majors