According firearmchronicles
Several other states have passed parking lot legislation. The argument is, allowing an employer to forbid an employee to store a firearm in their locked vehicle, effectively disarms them on their way to and from work.
In addition, it is argued, that employers violate employee rights to the employee’s property by insisting on control over what is in an employee’s vehicle.
In news coverage, Senator Jason Schultz makes the argument. From whotv.com:
Currently, someone with a conceal-and-carry permit cannot bring their firearm to work, if company policy does not allow guns on the premises. “We have hundreds of thousands of Iowans, law-abiding good Iowans with conceal carry permits who wake up and get children ready for school cannot exercise their second amendment right,” Sen. Jason Schultz, R-Schleswig.
Schultz said these legislation would allow for Iowans with permits to fully enjoy their second amendment rights.