The Precise tag has an ambiguous description in the book:
"Precise: You can use DEX instead of STR when using this weapon."
(1st edition, p396. Emphasis added)
To me that sounds like the player can choose to use DEX or STR, presumably based on how they are using the weapon.
The SRD wiki uses a different, more concrete wording:
"Precise: It rewards careful strikes. You use DEX to hack and slash with this weapon, not STR."
Which is the latest version? Is there official word on this somewhere?
Edit: There's actually a place in the book (p323) that uses the second description as well. Maybe the reference in the tag glossary is just outdated?