People who participate in certain activities that are bad for society are disqualified from testifying. Also, those who've commit certain sins whose punishment is corporal, and haven't yet repented, ...
Rambam (Hil. Edus 11:4) writes (translation from here): ...base people are disqualified as witnesses by Rabbinic decree. This refers to people who walk through the marketplace eating in the ...
I've heard that the reason we (most of us) don't eat the locusts enumerated as kosher in the Torah is that we cannot identify them. That is, we don't know what type of locust is referred to by the ...
Is a man who masturbates invalidated as a witness? The Gemara in Sanhedrin (26b) states that prohibited sexual relations do invalidate his status as a witness, but I could not find any literature on ...