There are currently 5 states that are not members of the Drivers License Compact (DLC). The following states of are not members of the DLC reciprocal agreement that all other states and the District of Columbia participate in:
Though these 5 states are not part of the DLC they still have their own agreements with other states to exchange information regarding traffic tickets.
For instance the Georgia Department of Driver Services (DDS) points' page states that they are authorized to suspend your license if its records or other evidence shows that you have accumulated 15 points within 24 months under the point system, including violations committed out of state. So they obviously receive information from out of state regarding traffic tickets and not only add them to your driving record but assign them points.
The DDS also notes that a Georgia licensed driver shall have their license suspended for a conviction of serious offenses in Georgia or any other state. Check with the DDS site for a list of these violations.
The Massachusetts Registry of Motor Vehicles (RMV) states that it has arraigned to share driving records with other states and have other states share violations of their motorists out of state citations with them. The RMV has decided to treat certain out of state violations as if they occurred in state and record them on your driving record.
The MA RMV does not list if all states inform them of out of state tickets of their drivers or not, likely all do. The RMV notes as well that out of state violation convictions may count toward surcharge-able events and thus possible license suspensions and Safe Driver Insurance Plan (SDIP) surcharges. Surcharge-able events are considered motor vehicle violations and at-fault accidents.
The Michigan Secretary of State (SOS) site has information showing that out of state tickets may still be added to a MI driving record. Their site states that if a Michigan driver gets a traffic ticket in another state that out of state offense is likely to eventually appear on your Michigan driving record.
It continues on to say if the violation substantially corresponds to a violation of a Michigan law, then the conviction will be posted to your driving record and points will be assessed as required by the Michigan Vehicle Code. If the ticket is for an offense for which a suspension would have been given if the ticket had been received in Michigan, then a suspension will be imposed after the posting of the ticket, allowing time for due process and the sending of a notification letter.
Michigan SOS does not state exactly which states they have agreements with but notes that most states are reciprocal and provide ticket information to the driver's home state. Michigan law requires that the same action be taken for tickets received out-of-state as those received in Michigan, therefore, points and suspensions may be imposed.
A Tennessee Department of Safety representative told us that if you are convicted of an out of state ticket and that state's court informed the TN DPS than the offense will go on a Tennessee driver's motor vehicle record and points will be assessed. The representative said he believed most states would report to them a conviction of an out of state traffic ticket of a TN licensed driver even though they are no longer part of the DLC.
According to the Wisconsin Department of Transportation, they do receive in from out of state courts information on WI licensed drivers and moving violation convictions. The WI DOT noted that no points are assessed for convictions of traffic offenses from other states but does note that the out of state traffic violation conviction will be entered on a Wisconsin driver record.
All of these non-DLC states have also noted that they will share with the home state of out of state drivers convictions of traffic offenses and other offenses such as DUI so even though they are not members of the Drivers License Compact. So these 5 states all share information regarding traffic violation convictions, and receive it in, from other states they are just not bound to the terms of the DLC agreement.
The states that are members of the DLC are required to report ticket convictions received by a motorist back to the state where the motorist is licensed to drive and follow other terms of the DLC. Each state then determines if an out of state offense will be placed on a person's driving record and if any points will be assessed. The 5 states that are not part of the DLC though all still seem to share with some if not all other states so just because you get a ticket in a non-DLC state does not mean that your state's DMV will not be informed of the violation conviction.
There are 3 main reciprocal agreements with regards to traffic violations in the US which are the Drivers License Compact (DLC) as you mentioned plus also the Non-Resident Violator Compact (NRVC) and the Drivers License Agreement (DLA). The DLA however does not yet have the state membership that the other two Compacts currently have.
The Non-Resident Violator Compact (NRVC) requires member states to suspend the driver's license of those who get traffic tickets for moving violations in other states and fail to pay them or otherwise legally take care of them.
The following states are not part of the NRVC:
Again like the DLC these non-member state may still have their own agreements with other states or have laws in place that allow them to suspend or penalize a driver that does not pay their out of state traffic ticket.
The DLC and the NRVC are supposedly being revised and combined into the new Driver License Agreement (DLA). In the effort to establish a one driver, one record system, the DLA hopes to be a more efficient and effective agreement for the jurisdictions to share and transmit driver and conviction information. However states have not gravitated to the DLA and so far only Connecticut, Massachusetts and Arkansas have signed up as members. There is legislature in other states pending though. Unlike the DLC and NRVC, the Provinces and Territories of Canada as well as the States/Federal District of Mexico can participate in the DLA.
There is also the National Driver Register (NDR) which all states and the District of Columbia report information to. The NDR contains records on those who have had their licenses revoked or suspended, or who have been convicted of serious traffic violations (i.e. DUI) and are perceived as problem drivers throughout the United States.
When a person applies for a driver's license any state's DMV should check to see if that driver's name is on the NDR file. If that person has been reported to the NDR as a problem driver, a license may be denied until the issue has taken care of and their license has been reinstated in the state that has the hold on their license.