The "Bag From L5 security screening Time" is the DateTimeUTC when the Level 5 security scan of the bag finished. This corresponds to the BagEventCode "BagFromSecScreen", with some additional information (typically BagEventLocation) identifying it as a Level 5 security screening. Always UTC.
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See BTL1T for a definition of IATA defined security screening levels. Given the nature of L5 it is unlikely with more information about this bag.