In such suit evidence of the general reputation of the place, or an admission or finding of guilt of any person under the criminal laws against prostitution, lewdness or assignation at any such place, shall be admissible for the purpose of proving the existence of such nuisance, and shall be prima facie evidence of such nuisance and of knowledge thereof and acquiescence and participation therein on the part of the person or persons charged with maintaining such nuisance as herein defined. If the complaint is filed by a person who is a citizen, resident or taxpayer of the county, it shall not be dismissed except upon a sworn statement by the complainant and his or its attorney, setting forth the reasons why the action should be dismissed and the dismissal approved by the prosecuting attorney in writing or in open court. If the court or judge is of opinion that the action ought not to be dismissed, he may direct the prosecuting attorney to prosecute such action to judgment at the expense of the county, and if any such action is continued more than one term of court, any person who is a citizen, resident or taxpayer of the county, or the Attorney General, or the prosecuting attorney, may be substituted for the complainant and prosecute such suit to final decree. If the suit is brought by any person who is a citizen, resident or taxpayer of the county and the court finds and enters of record in the case that there were no reasonable grounds or cause for such suit, the costs may be taxed to such person. If the existence of the nuisance be established upon the trial, a decree shall be entered which shall perpetually enjoin the defendants and any other person or persons from further maintaining the nuisance at the place complained of and the defendants from maintaining such nuisance elsewhere within the county.