The Detective Badge (探偵バッジ Tantei Bajji?) is a enchanted possession item treasured by the Spicy Agency. The Badge used to be part of supernatural experiments but then has been locked away with other possession items long before the series started. At the moment, the Badge belongs to Blair Hunter who uses it to transform into Detective Blair.
The Badge used to be part of supernatural experiments but then has been locked away with other possession items long before the series started. In case 1, the Badge has been stolen by Blair who wanted to find out what that 'thing' was. Outside the Agency, in order to stop a criminal, Blair accidently activated the powers of the Badge and transformed into Detective Blair. Ever since then, the Badge was the property of Blair Hunter.
The Detective Badge is a golden piece of metal roughly formed in the shape of a chestnut. The four leaf or wing like parts are supposed to resemble the nutshell. On the front "leaves" seven stars as well as three highlights are carved into the metal on each side. The part surrounded by the "leaves" is probably supposed to resemble the nut itself. The name of the Spicy Agency (秘密 Spicy Agency?) is cared into the metal and has been highlighted just like the word Detective (探偵?). However, the name of the agency is spotted at the upper part of the metal, while Detective can be found on the lower part. A big star is carved into the middle of the metal seperating the name of the Agency and the Detective.
As seen in episode one, the Detective Badge holds the power to transform the carrier into a magical girl-like being. In this case, it tranformed Blair into the supernatural heroine Detective Blair, the first Police Girl ever existing.