Any county or incorporated city or town in the state, its agents, servants, employees, and contractors, may use any poisonous substance, chemical, or spray in killing water hyacinths and other disagreeable or obnoxious vegetation in the waterways mentioned in s. 342.03, provided no such poisonous substance, chemical, or spray shall be used which might injure or destroy fish life or human or other animal life without first taking sufficient precaution to prevent the same.
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