Here have this...
Honest Tiefling's Badge of I'm Good, Honest
Price: 5,000 GP
Body Slot: -
Caster Level: 2nd.
Aura: Weak; DC 16 Abjuration.
Activation: -.
Weight: -.
When pinned to the wearer's shirt this badge reading "I'm a good guy, honest" alters the wearer's aura. Any attempt to magically detect the wearer's alignment detects the wearer as if they were Good instead of Evil (if they are morally Neutral or Good this item has no effect).
Prerequisites: Craft Wondrous Item, Undetectable Alignment
Cost to Create: 2,500 GP and 80 XP.