Pretty much anything commercial and not organic though now has residue, harmful or not. Many fruits and some vegetables are sprayed with anti-fungal agents or anti-sprout agents, ripening retardation chemicals or coated with waxes.
I just have to consider that going through a good hot compost pile, or even one not so hot but being in it for a year, and then whatever is left being diluted when spread over the whole garden would have to be better than putting it directly under your plant. Many of the chemicals used on non-organic produce outside the US would be illegal in the US, but they can be used on produce that is then imported.
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