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Metro added there could be some minor delays with Metrorail service so that deicer trains can clear rails of snow and ice.

Potassium acetate, a salt also used as an aircraft deicer, was mistakenly used by Oklahoma in a 2015 lethal injection.

Potassium acetate, also used as an aircraft deicer, was mistakenly used by Oklahoma in a 2015 lethal injection.

And pretreating roads before snow storms can help deicers be more efficient.

But road salts and deicers, mostly made of the same stuff as table salt, are not the only culprits.