Days after Illinois passed a law banning assault-style weapons and large-capacity magazines, dozens of county sheriffs say they won’t enforce the measure, claiming it is unconstitutional.

Displeasure appears strongest around the Chicago area, where top law enforcement officials in McHenry, DeKalb, Kane, DuPage, La Salle, Grundy, and Kankakee counties have publicly stated they will not enforce the new legislation, WABC-TV reported.

DuPage County and its 920,000 residents is the largest so far to defy the law.

…”I, among many others, believe HB 5471 is a clear violation of the 2nd Amendment to the U.S. Constitution,” LaSalle County Sheriff Adam Diss wrote in an open letter, posted on the Illinois Sheriffs’ Association Facebook page.

“Therefore, as the Custodian of the Jail and Chief Law Enforcement Official for LaSalle County, that neither myself nor my office will be checking to ensure that lawful gun owners register their weapons with the State, nor will we be arresting or housing law-abiding individuals that have been arrested solely with non-compliance with this Act,” he wrote.

Several other sheriffs have posted similar letters on the page, which were crafted by the association. At least 74 different sheriff’s departments say they will not enforce the new legislation.