(a)   Upon receipt of an application, an investigation of the applicant's business reputation and character shall be made.
   (b)   The application shall be approved unless such investigation discloses tangible evidence that the conduct of the applicant's business would pose a substantial threat to the public health, safety or general welfare.  In particular, the following tangible evidence will constitute valid reasons for disapproval of an application:
      (1)   The applicant has been convicted within the last three years of any felony, or convicted within the last three years of any misdemeanor involving a sex offense, a drug trafficking offense or any offense of violence against persons or property;
      (2)   The applicant has made willful misrepresentations in the application;
      (3)   The applicant has committed prior violations of ordinances pertaining to itinerant merchants, peddlers, solicitors and the like;
      (4)   The applicant has committed prior fraudulent acts; or
      (5)   The applicant has a record of continual breaches of solicited contracts.