NEW YORK -- When Jackie Narkiewicz switched careers and became a librarian, she thought she'd spend her workdays "drinking hot beverages and discussing literature with people."

But during her 16 years as a librarian on New York's Long Island, Narkiewicz has also faced a man threatening to kill her and a patron screaming while cutting her own hair in the bathroom. For her job, Narkiewicz has been trained in CPR and mental health crisis response and carries the opioid overdose antidote naloxone.

As libraries nationwide contend with a surge in patrons seeking refuge in the stacks because of poverty, drug addiction or mental illness, a growing number of institutions have social workers on staff.

It's the latest step in an evolution libraries have been dealing with for years as homelessness and the opioid crisis reach emergency levels and patrons have come to rely on libraries as free, safe spaces open to all.

Though homelessness has seen some declines in the U.S. since the recession, it has surged in cities such as Seattle, where a homelessness state of emergency and a spike in questions from library patrons about things such as housing, transportation and food led the public library system to hire its first full-time social worker in 2018.

Other libraries, unable to afford such a step, have trained librarians to handle certain emergencies themselves. That's caused some debate among library workers about whether they're being asked to adapt to an evolving job or to do work going too far beyond their expertise.

"I can get you a phone number, I can get you a book you want ... but when you're dealing with mental health issues, I don't feel appropriately trained for it," Narkiewicz said.

A few master's degree programs for aspiring librarians have classes on mental health, but most don't. To help fill in the gaps, an estimated 40-plus library systems have full-time social workers on staff, according to Whole Person Librarianship, an organization that tracks such partnerships.

At the Queens Public Library in New York City, resident social worker Shantel Johnson oversees a team of library case managers, but she's also available to help librarians communicate with struggling patrons, connect visitors to services or just listen to people.

"They'll open up to staff, and staff is doing 14 different things," Johnson said. She said she regularly helps patrons who are homeless, experiencing abuse or having trouble applying for jobs.

The Queens Public Library also started stationing New York University social work interns in some branches last year, as does the New York Public Library, which got its first interns two years ago.

Library patron Sofia Ciniglio was meeting twice weekly with an intern at a Manhattan branch last year for career advice. But their conversations eventually involved her family, feelings and personal life. The intern introduced Ciniglio to a library where she could learn Braille, which she'd been curious about.

"She was very much a good listener, very attentive, and she knew who I was and the nuances of how I go about things," Ciniglio said.

The NYPL's librarians, meanwhile, are trained to de-escalate conflicts but aren't asked to do more in-depth mental health crisis training.

Spokeswoman Amy Geduldig noted the library "is not a social services organization, and its staff are not medical or mental health professionals." The NYPL, the nation's busiest library system, still hasn't hired a full-time licensed social worker, though Brooklyn did in 2015 and Queens did in 2018.

In some libraries without professional social work help, employees are being asked to take on new tasks.

At the San Diego Public Library, a state library grant has funded employee trainings in mental health first aid since 2016. Librarian Joseph Miesner says the training helped him personally when he came across a suicidal patron.

In small town Titusville, Pennsylvania, library director Justin Hoenke recently agreed with his library's board all staffers should be trained to administer naloxone if needed.

"This is a new requirement of the job," Hoenke said. "If they're not comfortable with it, they kind of have to re-evaluate their life and their job. You have to change with the times."

Fobazi Ettarh doesn't see it that way. An academic librarian at Rutgers University in Newark, she said too many expectations can distract librarians from their work, and she personally wouldn't feel comfortable as a first responder to an overdose.

"It would just be a lot for my mental health," she said.

Research suggests other librarians feel the same way. A 2018 survey of librarians in Pennsylvania found many reported they already felt stressed from trying to answer questions from patrons about mental health and social services, even without handling acute emergencies in the library.