D.C. Mun. Regs. tit. 18, § 1302
1302.1 A commercial driver's instruction license shall be issued only to an individual who holds a valid noncommercial driver's license or a valid commercial driver's license if applying to operate commercial vehicles in a group or endorsement other than the group or endorsement that he or she is authorized to operate.
1302.2 A commercial driver's instruction license shall be issued only to an individual who is twenty-one (21) years of age or older.
1302.3 A commercial driver's instruction license shall only be issued to persons who have successfully passed the appropriate knowledge tests with at least an eighty percent (80%) score.
1302.4 A commercial driver's instruction license shall be issued only to persons who meet the physical qualifications and examinations provided in § 1327.
1302.5 A holder of a commercial driver's instruction license shall not operate a commercial vehicle unless accompanied by a driver who has been licensed for at least one (1) year to drive the type and class of vehicle being used.
1302.6 A holder of a commercial driver's instruction license shall not operate a commercial vehicle unless accompanied by someone who is fit and capable of exercising physical control over the vehicle and who is occupying a seat beside the driver.
1302.7 The commercial driver's instruction license shall be valid for a limited period of not less than thirty (30) days.
1302.8 These requirements shall not apply to Class "D," Class "M" and Class "N" driver's licenses.
SOURCE: Final Rulemaking published at 51 DCR 10913 (November 26, 2004); Final Rulemaking published at 53 DCR 2206 (March 24, 2006).