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Them bullets leaching lead into the soil
There were not limits on lead in baby food? >

There was LEAD in baby food?! >

According to the FDA in the article: 

Because crops absorb nutrients from soil and the environment as they grow, they also take up contaminants like lead

I wonder if there is a way to actually treat the ground or take lead out of the crops. Otherwise I don't know how they would get it out. >

Unfortunately getting heavy metals out of soil is slow and inefficient. You basically have to grow plants that produce a lot of biomass quickly to take up the contaminants, and incinerate them then process the ashes to get the heavy metals.
But the problem is that the plants only take up so much, so it can take decades to get the soil to a low level, and exponentially longer to remove them as the concentration gets lower.
It's one reason why heavy metal contamination in soil and water from factory run off and similar events can be so devastating.
And removing lead from the food directly would not only ruin the integrity of the food, but would also strip out essential minerals like iron.
*Edit: Changed formatting for better legibility >

And why there's lead in the soil? asked a guy driving an old F-150
Because we used to put lead on fuel to run cars like yours >

Don’t forget all the farmers that grew up hunting.