Its a criminals new best friend
The Combination Handcuff Key and Writing Instrument also referred to among the non-incarcerated as Patent#US 6880369, is comprised of a pen that has a writing end and a closed end and a cap that will fit on either one. A handcuff key is formed on the closed end of the cap, which extends longitudinally. When the writing end of the pen is inserted into the one end of the cap, the pen and cap together form a handle for the handcuff key that can be easily carried and accessed.
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