The fact that any slot machine or punch board is set up, operated,
conducted, displayed, or exposed in a public place for any
considerable length of time, provided the time and place is sufficient
to put a reasonably efficient officer upon inquiry and notice, this
shall be received along with other evidence in proving that the
sheriff and district attorney of the county and the constable and
policemen of the district, city or town where the same occurred had
knowledge of the same.