Use this skill to tell when someone is bluffing or lying to you. This skill represents sensitivity to the body language, speech habits, and mannerisms of others.
Check: A successful check allows you to avoid being bluffed (see the Bluff skill). You can also use the skill to tell when someone is behaving oddly or to assess someone's trustworthiness.
In addition, you can use this skill to make an assessment of a social situation. With a successful check (DC 20), you can get the feeling from another persons behavior that something is wrong, such as when you're talking to an impostor. Also, you can get the feeling that someone is trustworthy and honorable.
Try Again?: No, though you may make a Sense Motive check for each bluff made on you.
Special: You can take 10 when making a Sense Motive check, but you can't take 20.
A character with the Attentive feat gets a +2 bonus on all Sense Motive checks.
You can use Sense Motive to detect that a hidden message is being transmitted via the Bluff skill (DC equal to the bluff check result of the sender). If your check result beats the DC by 5 or more, you understand the secret message as well. If your check fails by 5 or more, you misinterpret the message in some fashion.
Time: A Sense Motive check may be made as a reaction to another character's Bluff check. (When that's the case, your GM may roll your Sense Motive check in secret, so you don't necessarily know someone's trying to bluff you.) Using Sense Motive to get a sense of someone's trustworthiness takes at least 1 minute.