you can sense the motivations and intent of others and assess the truthfulness in relation to what they are displaying or claiming in social situations. Using subtle clues – variations in speech, body language, reading between the lines, etc. – you get a deeper sense of their motives, moods and attitudes. If successful, it will reveal that some part of what is being revealed is not 100% truthful or accurate. It will NOT reveal the actual truth.
i20™ Making Checks: In going with the "Rule of Averages", only a single Result Check is made to determine Success or Failure and degree/quality of either of an Activity. The GM will { } Narrate it, and/or you may petition for an appropriate impact when anything other than a basic outcome is indicated. Note that checks made without proficiency can only apply a Attribute bonus no greater than the character's Proficiency Bonus.