It may affect the nervous system, brain chemistry, cause inflammation or may affect the thought process of individuals leading to criminal activity as they are not thinking normally

The Biological Response to Pollution and How it May Cause Crime

The lead-crime hypothesis is a theory in criminology and public health that posits a causal link between early childhood lead exposure and increased rates of violent crime later in life. The mechanism is believed to be lead's neurotoxic effects on brain development, which can result in learning disabilities, reduced impulse control, and increased aggression. This hypothesis is supported by ecological studies that show a strong correlation between the rise and fall of leaded gasoline use and subsequent trends in violent crime rates with a time lag of about two decades.

The Lead-Crime Hypothesis

- Biology is at least a partial factor in criminality whether its the independent variable or a co-factor

Ohio State University, Columbus

- Use of the scientific method (This is why Criminology uses the scientific method when conducting research)
- People are not responsible for their action, biology forces are the main cause of crime

Positivism Definition

Siegel, L. J. (2000). Criminology. Criminology: Siegel, Larry J: Free Download, Borrow. Wadsworth/Thomson Learning. https://archive.org/details/criminology00sieg. 

Criminology

- Conduct autopsies of inmates and of living inmates and found certain body similarities between them all
- Atavism- genetics of a criminal are alike to previous generations more specifically the more violent primitive versions of man
- Women are less likely to be criminals and those who are criminals are alike to ment (the masculinity hypothesis)
- Also created categories of criminals

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