Nov. 24, 2020

Real Crime Episode # 9 part # 4 with retired NYPD CSI detective Sergeant John Paolucci.

Real Crime Episode # 9 part # 4 with retired NYPD CSI detective Sergeant John Paolucci.

In this episode retired NYPD CSI expert John Paolucci goes into more depth in regards to the science of ballistics and ricochet. He gives the investigator valuable information on how to determine ricochet marks in regards to where a projectile hits its target. He talks about a bullets flight path and the fact that it may encounter "intermediary targets" prior to the last surface that it impacts which is known as the "terminal target." To best understand bullet ricochet characteristics we first need to understand the conditions under which a ricochet will occur. In order for a ricochet to occur the “critical angle” must not be exceeded. The critical angle is the maximum angle at which a ricochet will occur and it is dependent on two (2) main variables: i. Type of cartridge that was fired ii. Substrate on which the ricochet occurred Smaller, faster moving bullets tend to fragment upon impact rather than ricochet so they would have a lower, or more acute critical angle than larger than larger, slower moving bullets. With this in mind, a .45 ACP moving at approximately 800 fps is an ideal cartridge to use when conducting experiments with ricochets. Investigators in the field typically would not have the requisite information available to estimate a critical angle when a ricochet marking is discovered at a crime scene so field testing with a similar cartridge and the same or similar substrate would be a benefit to the CSI’s analysis when calculating the approximate critical angle is necessary. www.patreon.com/otcpod1

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