Illinois already does this....
https://handgunlaw.us/states/illinois.pdf (PDF will open)
Non-Resident Permit
NON-RESIDENTS
In accordance with 430 ILCS 66/40 (b), out of state residents may be eligible for an Illinois Concealed Carry
License if your state meets the definition of substantially similar as established by rule. See 20 Il. Admin.
Code 1231.10.
Currently, the states identified below have been determined to have laws related to firearm
ownership, possession, and carrying that are substantially similar to the requirements to obtain a license
under Illinois’ law; and, therefore, may apply for an Concealed Carry License. This list will be updated as
additional states are identified as substantially similar. Further Information concerning the regulations for
non-resident applications can be found at 20 Il. Admin. Code 1231.110.
1.Arkansas2.Idaho3.Mississippi4.Nevada5.Texas6.Virginia
You can see the Illinois State Police Listing of these states and the Criteria they useHere.
Note:Only residents of the states listed above have been approved by the Illinois State Police to apply for
an Illinois Non-Resident Permit.