Objective: The objective of this study was to describe the suitability of adult drug court handbooks for participants with low literacy. Methods: A convenience sample of seven drug court participant handbooks from urban drug courts in three regions of the USA were assessed for reading and literacy suitability for low-literacy learners using the Fry Index Readability Formula and the Suitability Assessment of Materials (SAM). The Fry Index Readability Formula follows an objective approach using a three-step process of counting three random samples of 100-word passages to calculate grade reading level. The SAM uses a 0-2 range scale to assess six distinct factors of written materials to yield a numerical score as superior, adequate or not suitable. Results: All handbooks were written above the reading level for low-literacy learners with scores at the eighth grade reading level or higher. A few handbooks scored adequate ratings in some SAM categories, and only two handbooks scored superior ratings in any one category. Overall SAM scores showed all handbooks were not suitable for low-literacy learners. Conclusion: Findings indicate that drug court participant handbooks from this sample are not written for low-literacy learners. Key recommendations are to develop a drug court handbook appropriate for participants with low literacy, assess drug court participants' literacy for reading grade level and comprehension and provide multi-modal teaching formats to promote effective learning.