Cincincinnati Enquirer  [Printer-friendly version]
June 25, 2006


[Rachel's introduction: Evidence continues to accumulate linking
toxic metals to aggression, violence, and poor social control. Added
to that are diminished IQ and the frustrations of doing poorly in
school. The conclusion seems inescapable that a truly preventive
approach to childhood exposures to toxic lead could avoid prison
for some young men.]

By Sharon Coolidge

Researchers knew lead poisoning could be deadly to children and cause
brain damage in the late 1970s.

What impact that had on the children's behavior was unclear.

That's why Kim Dietrich, a professor of environmental health at the
University of Cincinnati, spent from 1979 to 1984 recruiting 305
children with lead in their blood from Cincinnati's poorest
neighborhoods for a study that's allowed him to study the children as
they grew.

Now, 22 years later, one thing is clear: The more lead in a person's
system when they're young, the more likely they are to engage in
delinquent behavior such as assaults, property crimes and disturbing
the peace -- acts that carry the risk for arrest, experts say.

"We all know there is a relationship between lead and lower IQ, but
there is an extension to criminal activity," said Dietrich, who is
director of UC's division of epidemiology and biostatistics program
and conducted the study with a team of four others. "And this has
terrible implications for not only the individual, but for society as
a whole."

While the National Institute of Health estimates that lead-poisoned
children cost the county an estimated $17.2 billion every year just in
medical costs, lost work days and reduced productivity, Dietrich's
research means it also potentially costs millions more in criminal
justice costs and medical care for crime victims.

Dietrich's findings, based on a look at his study group when its
members reached age 16 and 17, were published in 2001.

Dietrich and the study's others authors have monitored the group at
ages 20 through 22, and found the trend continues. "Those exposed to
higher levels of lead more likely to engage in criminal activities,
some that resulted in convictions and incarceration," he said.

"I was interested in this because we know lead attacks areas of
children's brains that are involved in aggression and impulse
control," Dietrich said. "It was logical to examine this relationship
between lead exposure and incidents of delinquent behaviors."

Pittsburgh researcher Herbert Needleman, using his own group of
children who had lead poisoning, reached similar conclusions. He found
juvenile delinquents are five times more likely than other children to
have elevated lead levels.

Lead exposure in early childhood may have played an important role in
the national epidemic of violent crime in the late 20th century and
the dramatic decline of crime rates over the past decade, said Rick
Nevin, an economist for the National Center for Healthy Housing in

Nevin, hired by the Department of Housing and Urban Development in the
early 1990s to do a cost-benefit analysis of removing lead paint from
public housing, said he was stunned to discover a strong relationship
between the use of leaded gasoline and violent crime. "The statistics
show lead has had a significant impact on crime," he said.

Dietrich knows skeptics might say, "Well, the people grew up in Over-
the-Rhine and the West End, so they're more likely to commit crimes."
But he said the study was adjusted for social class, quality of care
they got as children, nurturing they received and their mother's use
of alcohol, drugs and cigarettes.

Children in the highest lead group on average said they committed five
more acts of delinquency over the last year than children with the
lowest levels.

"There are a lot of causes of crime," Dietrich said. "These children
are already living in environments with social forces that are
conducive to crime. Then, on top of that, their central nervous
systems are being attacked by lead, which reduces their ability to
resist those forces.

"The city needs to act when they are children, not when they're adults
committing crime," he said.