LANSING (AP) — Gov. Gretchen Whitmer on Friday tweaked Michigan’s tougher order to wear masks in public, clarifying that they are not required while voting and telling businesses they cannot assume people who enter without a face covering are covered by exceptions.

The changes came a week after the Democratic governor updated her mask rule to add a maximum $500 fine and require businesses to refuse entry to those without a face covering.

Businesses may not assume maskless customers are exempt but can “accept a customer’s verbal representation that they are not wearing a face covering because they fall within a specified exception,” according to the order. That could include being unable to medically tolerate a mask, for instance.

Retailers had raised concerns about trying to determine the validity of an exemption.

The order also specifically exempts mask wearing for the purposes of voting at a polling place, though it is “strongly encouraged.” The latest measure continues to state that it does not curtail constitutional protections — such as voting — but Whitmer said the change provides clarity.

The governor also tightened an exemption for law enforcement officers, firefighters and paramedics — saying they must wear a mask unless it would “seriously interfere” with their job.

Those eating or drinking while seated at a restaurant remain exempt. So too are people exercising, officiating a religious service, communicating with the hearing-impaired, giving a speech or receiving a service for which the temporary removal of a face covering is necessary.