Chances are you wont be able to reuse the poster paint. However, you could try crushing it thoroughly and then add a couple of drops of water and stir. If you try to dissolve the paint with thinner or stripper it will probably loose its integrity.
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Yes, they are, once dry.
Once they have dried, enamel and urethane paints are non-toxic.
Reconstituting dried out watercolor paints is often somewhat difficult. Most artists recommend trying to add a small amount of water to the paint to reconstitute.
No, once oil based paint has dried, it is not a conductor of electricity.
Water based paints or acrylic craft paints are the best to use on Styrofoam. Water based paints, specifically poster paints, work well with younger kids as they can get a really good and thick coverage of paint on the polystyrene shape.