States do not get to decide on a whim who they are going to enter into the federal NCIC database. There are established guidelines in which a state risks loosing access to the database if they violate the terms and conditions of use.
An example is if a state or agency is not protecting the information against unlawful disclosure they can loose access and even face fines and criminal charges.
The database information is to be used for legitimate law enforcement purposes only. Federal law already forbids the federal government from tracking this information and they would not take kindly for some state to use their database to violate federal law.
Hopefully President Trump will enforce them. President Hillary clearly won't.