Kentucky will begin using State-to-State Verification Service (S2S) and S2S Driver History Record (DHR) functionality on Monday, June 8, 2026. Tasks related to onboarding Kentucky will be conducted during the weekend of June 6, 2026. During this process (Saturday evening to Monday morning), there will be periods during which the Commercial Drivers License Information System (CDLIS)/S2S Central Site (Central Site) will be in inquiry-only mode or unavailable (over and above the regularly scheduled maintenance window of 2:00 AM ET to 5:00 AM ET on Sunday, June 7, 2026). AAMVA is taking all steps to minimize service interruptions and will be sending alerts notifying states of Central Site availability. Read more here.