private investigator

noun
private detective. Abbreviation: PI, p.i., P.I.

Origin:
1935–40

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
He also claimed that he was a registered private investigator, seeking to probe
  the illegal trade of uranium.
Now that the bat-wielding, wiretapping private investigator is behind bars,
  they're downright terrified.
She hired a private investigator to find out who her husband really was.
Consider hiring a private investigator to perform a background check before you
  make any commitment.
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