Section 28-408.4.4. Effect of failure to obtain plate and/or seal

If a holder
  of  a  certificate of competence has held the certificate for five years
  without a plate and/or seal, then  the  commissioner  may  require  said
  person  to submit an affidavit and supporting documentation satisfactory
  to the department stating that over the five-year period the  individual
  has  been  engaged in the design and installation of plumbing systems in
  the United States under the  direct  and  continuing  supervision  of  a
  licensed   master  plumber.  If  the  holder's  qualifications  are  not
  satisfactory to the commissioner,  the  commissioner  may  require  such
  person  to  submit  to  reexamination or to provide evidence of retained
  proficiency. In addition, additional fees will be due as  set  forth  in
  this chapter.