Section 28. Every person conducting a lodging house shall within twenty-four hours after he is ordered to do so by the licensing authorities keep a register. The said authorities may issue such order at any time, and shall do so upon receipt of an affidavit of a commissioned officer of the United States army or navy or a police officer stating that the affiant knows or believes such lodging house is being used for immoral solicitation, immoral bargaining or immoral conduct.