The testimony of witnesses may be taken:(A) By affidavit;(B) By deposition;(C) By oral examination.
Ohio Rev. Code Ann. § 2319.01, under Chapter 2319 | Affidavits; Depositions.
Ohio Rev. Code Ann. § 2319.01
The testimony of witnesses may be taken:(A) By affidavit;(B) By deposition;(C) By oral examination.