"You talk to any sheriff 20 years ago and they would say suicides are not preventable," said Lindsay Hayes, author of the national study. "Today, more often than not, a sheriff is going to be much more proactive or better-read about that issue."
    Statistically, white male inmates are most likely to die by their own hand, both nationally and in Texas. Women make up just a fraction of total jail suicides, and Bland was the only black woman found to have killed herself in a Texas jail since 2009.
    The heightened risk of suicide behind bars results from various factors, including those that arise from the jail environment itself.
    "Suicides are often spontaneous and notoriously difficult to forecast," said a 2013 article on Texas jail suicides in the LBJ Journal of Public Affairs published by the University of Texas. "Some stressors may come from the jail environment itself where isolation, loss of control, conflict with other inmates or staff, frustration with legal proceedings, or distress and shame over incarceration may flare suicidal tendencies."
    State law requires all county jails to use one of two "objective jail classification" forms to determine an inmate's suicide risk and whether enhanced security measures are needed, said Brandon Wood, executive director of the Texas Commission on Jail Standards.
    It's then up to each jail to determine how inmates are monitored, he said, noting that state law requires only that a county inmate be observed in-person by jailers at least once every hour. An inmate who may be suicidal or who displays bizarre behavior must be checked every 30 minutes.
    A doctor's order takes priority, Wood added, so jailers must comply if there's a medical order to monitor an inmate more frequently.
    Waller County Sheriff Glenn Smith has said Bland was not on suicide watch and was supposed to be observed once every hour. But he also acknowledged that jailers at least once violated state rules by interacting with her via intercom and not in-person.
    The intercom conversation, during which Bland asked how to make an outgoing call using a phone in her cell, came about an hour before her body was found July 13 hanging from a noose fashioned from a plastic garbage-can liner.
    Two jailers who assessed Bland when she was being booked in the county jail were "adamant" that she appeared fine, the sheriff said.
    Bland's relatives have refused to accept authorities' finding that she took her own life. Her death remains under investigation, as does the traffic stop that led to her arrest and detention three days earlier.
    Authorities announced Thursday that an autopsy revealed no injuries that would suggest she was killed by someone else.
    When the 28-year-old Chicago-area woman was booked into the county jail on July 10, records show, she reported having attempted suicide after a failed pregnancy. Her sister said the miscarriage happened in 2014. Other booking papers indicated Bland did not have suicidal thoughts at the time of her arrest.
    The commission cited the jail last week for violating standards on staff training and observation of inmates, and the sheriff said he was forming a task force to review jail procedures.
    Nationally, about 33 percent of all inmate deaths resulted from suicide from 2010 through 2012, compared with 29 percent for the same time period in Texas.
    Women have been responsible for just 14 of the 140 inmate suicides in Texas since September 2009, when the jail commission began tracking deaths, according to data released to The Associated Press immediately after Bland died.
    With jails becoming the largest providers of mental health treatment in many communities, they need more resources and better standards to keep up with increasing demand, said Michele Deitch, a University of Texas law school lecturer.
    Many people who are arrested are already suffering from mental illness, trauma or addiction, Deitch said.
    "All of those factors combined with the trauma of suddenly being in jail — the realization of the enormity of what has just happened to them — all of those things can be combined to make them particularly vulnerable in that setting."