In 2019 Illinois passes a law which will require inspection of any public places to determine if the paint used on the walls contains lead. Illinois will charge the paint manufacturer of the paint used with a crime if the finds lead in the paint. This is an example of

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This is an example of an ex post facto law, which makes actions illegal after they were performed. Charging paint manufacturers for using lead in paint after the fact (if the paint was used before the law was passed) is an application of law retroactively.

In 2019 Illinois Passes a Law Which Will Require Inspection