In civil court, can I use a deposition from someone else's lawsuit as evidence to impeach or counter the testimony of the same deponent who will likely be a witness in my upcoming trial? Or to impeach the deponents affidavit that will surely be part of it? There is one in the docket of another court and a different one posted on the deposing attorney's website. If so, what steps are required to ensure the deposition(s) is allowed in as evidence? Thank you.