Lead paint leaching into soil

M* I*

Could anyone provide some educated insight into this
issue?  Say people are using bricks (Chicago common
ones) that have paint on them in garden plots.  I am
not talking about a lot of paint, but wondering more
about whether there is a known level of dangerous
exposure.  I realize that the safe answer would be not
to use any of these bricks.  But I'm talking about a
community garden that has little paths of recycled
bricks and wondering if I should start asking people
to remove them.  

Thanks. Marjie I. 

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