Acting Mayor Kim Janey appeared to voice skepticism on Tuesday about Boston copying New York City’s move to require proof of Covid-19 vaccination inside restaurants and gyms.

The New York requirement goes into effect later this month and enforcement begins in mid-September, according to news reports. New York is the first major US city to initiate such a policy.

The requirement comes as US cities and states grapple with the contagious Delta variant.

“We know that those types of things are difficult to enforce when it comes to vaccine,” Janey said at an unrelated event, according to the Boston Herald.

“There’s a long history in this country of people needing to show their papers,” Janey added, referring to both during and after slavery, up to “what the immigrant population has (had) to go through” more recently.

“We’ve heard Trump with the birth certificate nonsense,” she continued. “Here, we want to make sure that we are not doing anything that would further create a barrier for residents of Boston or disproportionately impact BIPOC [Black, indigenous and other people of color] communities.”