636.5  Attorneys not receivable as surety.
  Attorneys at law shall not be accepted as sureties upon any official bonds provided for in section 636.4.
[S13, §358; C24, 27, 31, 35, 39, §12755; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §682.5]
C93, §636.5

See §633.182 
Similar provision, §621.7