
During the discovery process in a civil lawsuit, how can you be sure they're turning over everything unaltered?
In criminal investigations, the police can generally request the data from social media companies or physically seize and search whatever evidence is relevant themselves.
But during discovery in a civil lawsuit, when you request the other party to produce evidence, how can you be sure that they'll comply in good faith and not hide/alter evidence? Let alone how there could be genuine disagreement/ambiguity regarding what's "relevant". One example: NFL player Tyreek Hill was once sued by an OnlyFans model for allegedly breaking her leg. At one point, his legal team demanded:
> The list of demands includes any photographs, videos, social media posts, reposts, comments and private messages – including any deleted messages – discussing either the incident or Hill. The same goes for any 'text message, iMessage, WhatsApp messages, Facebook messages, Instagram messages, X (Twitter) direct messages, emails, letters, instant messages, group messages or any other electronic communication, sent or received… between plaintiff and any relative (including her sister)… discussing or commenting on the incident or defendant at any time.'
Realistically, how do you ensure this is authentic? What stops her from just not turning over evidence Hill doesn't already know should exist, and thus there's "plausible deniability" (no smoking gun)? It seems the only way you could know for sure is if you subpoena and search literally all of their social media accounts and devices, which seems pretty invasive, and thus objectionable on the grounds of being overbroad.
E: To clarify, I understand attorneys would never risk their careers by knowingly allowing/encouraging clients to do this. I'm more wondering what stops the parties' from hiding evidence if they also don't reveal it to their attorneys.