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WhatsApp and Signal messages at risk of surveillance following EncroChat ruling, court hears | Computer Weekly
(www.computerweekly.com)
This is a most excellent place for technology news and articles.
This is much much harder though, and would risk exposing the vulnerabilities they are using, so they likely won't use these methods unless it's higher profile and involves some higher up govt entities. Your normal street crime cop shop won't be able to do this.