When objection is made to the admissibility of evidence, such evidence may be received subject to a later ruling. The board, either with or without objection, may exclude inadmissible evidence or order cumulative evidence discontinued. Parties objecting to the introduction of evidence shall state precise grounds of such objection at the time such evidence is offered.
Wash. Admin. Code § 298-08-420
Order, § 298-08-420, filed 1/13/70; § 42, filed 12/13/67.