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According to the passage, there is scientific evidence to suggest that ----.
In the past, lead poisoning was thought to arise from
pica (abnormal ingestion) among children living in
old, broken-down houses with peeling layers of leadbased
paints. In the past two decades, lead
intoxication has occurred with decreasing frequency.
This may in part be related to less use of lead in paint
and leaded gasoline; several studies relate
environmental lead contamination to traffic density
patterns. In the United States, hundreds of
occupations involve potentially significant exposure.
It is estimated that more than 800,000 American
workers have potentially significant lead exposure.
Lead and other metal workers or miners, storage
battery workers, and pottery makers are particularly
heavily exposed. Workers in auto manufacturing,
ship building, paint manufacture and printing
industries are also at substantial risk, as are house
painters and those who repair old houses. In past
centuries lead was added to wine to sweeten it, a
deception that was eventually made punishable by
death. Recently, adding lead to various herbal and
folk medicines has resulted in poisoning. Bullets left
in the body can result in lead poisoning, especially if
a joint is involved, because synovial fluid appears to
be a good solvent for lead. The interval between the
bullet getting embedded in the body and clinical
evidence of lead poisoning has ranged from 2 days
to 40 years.