You must obtain an A3 (Med Cert Exempt) restriction in addition to your K restriction if:
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If you have an active CDL, and you operate in a capacity in which you self-certify either as "Interstate - non exempt" or "Intrastate - non exempt", then you MUST have a valid, current DOT medical card. Period. The only time you do not need a DOT medical card with an active CDL is when you operate within the criteria for exempt usage - exclusively.