If used for a lie, I'll probably die,
If used for the truth,
I'll need further proof,
Use me for truth,
And add in a lie,
I'm more likely to tie...

What is the answer

i'm not sure but i was thinking it could be a secret, crime evidence, or an accusation.

Explanation:

appeal to ethos is your answer.

shakespeare was famous for writing in iambic pentameter, which is a specific way of rhyming sonnet lines in ten syllables. there are also forms of unrhymed iambic pentameter, as in macbeth, with the noble characters.