Sorry. Not familiar with the acronym "OCL." perhaps you could re-submit the question spelling out what that is.
Generally speaking an investigation would not show on a background check unless it resulted in arrest. A background check for sensitive employment or government/police employment will probably show the investigation whether or not you were arrested.
In most cases, not unless you were arrested and charged with a criminal offense. In the UK, an enhanced criminal record check may reveal information about an investigation if the police believe that the information is relevant to a recruitment decision.
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There are several different options in order to learn about crime investigation. One option would be for example to check the Birmingham City University. There one can get a degree in Criminal Investigation, which includes also work in the crime investigation area. Another option would be to check local police departments in order to find out more about the daily work of a crime investigator.
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Contact your local police department and give them the serial number. The Police can check on the stolen gun list maintained by the BATFE. If the gun is stolen, the Police will conficate the piece and begin investigation of how it was acquired.
"Carte blanche" is a blank check, that is an unlimited authorization.
BI under driving record is a background investigation. This is done to check driving record, credit standing, and any arrests or encounters with police.
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"Carte blanche" is a blank check, that is an unlimited authorization.