Check: A successful
check lets you avoid being bluffed (see the
Bluff skill). You can also use this skill to determine when "something is up" (that is, something odd is going on) or to assess someone's trustworthiness.
Discern Secret Message: You may use Sense Motive to detect that a hidden message is being transmitted via the
Bluff skill. In this case, your Sense Motive
check is opposed by the
Bluff check of the character transmitting the message. For each piece of information relating to the message that you are missing, you take a -2 penalty on your Sense Motive
check. If you succeed by 4 or less, you know that something hidden is being communicated, but you can't learn anything specific about its content. If you beat the DC by 5 or more, you intercept and understand the message. If you fail by 4 or less, you don't detect any hidden communication. If you fail by 5 or more, you infer some false information.