`In order to constitute the house a common gaming house, it is
not necessary to prove that any person found playing at any game
was playing for any money, wager, or stake. The police may enter
the house on the report of a superintendent, and the authority of
a commissioner, without the necessity of an allegation of two
householders; and if any cards, dice, balls, counters, tables, or
other instruments of gaming be found in the house, or about the
person of any of those who shall be found therein, such
discovery shall be evidence against the establishment until the
contrary be made to appear. Those who shall appear as witnesses,
moreover, are protected from the consequences of having been
engaged in unlawful gaming.'[151]