My Digimon that gained <Security A. +1> and has this card in its digivolution cards was deleted in battle with an opponent's Digimon when my Digimon had 10000 DP, then I performed a security check using <Piercing>. If the [Security] effect on the checked card reduces the DP of the Digimon with this card in its digivolution cards to 9000 or less, can I still perform the 2nd security check using this card's <Piercing>?
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Official Ruling
Yes, you can. <Piercing> activates as soon as your opponent's Digimon is deleted in battle, therefore you can still perform a security check even if the effect is lost after activation.
Source: BT17-079 Takuya Kanbara