On 8 April, an article from Estlund PA explains that blocking is an interim measure that an attorney or client can request while the case is being studied by INTERPOL. When this happens, the notice is not visible to INTERPOL’s member countries, and no detention or extradition activity should be taken in relation to that Red Notice while it is blocked.
https://www.rednoticelawjournal.com/2021/04/blocked-red-notice-what-does-it-mean/
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