ADHD results from lowered levels of certain neurotransmitters, one of which is noradrenaline. This regulates our behaviour and inhibits impulsive actions. With lowered noradrenaline, the act of stealing and/or lying is not inhibited as strongly as it would with higher levels of the neurotransmitter.
It is for this reason that ADHD left untreated, often co-exists with conduct disorders, substance abuse etc in adults.
Please note, however, that stealing and lying without other ADHD symptoms would likely fall into the conduct disorder category and not ADHD. An assessment with a neurologist or psychiatrist and psychologist is recommended.
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