What happens

[justchangemybloodyname]

TRIGGER WARNING

Need some advise on a situation, I don't want to be googling this for reasons that'll become obvious.
If someone gets their house searched because of a suspicion of child pornography and currently no arrests, just all electronics removed for further searching and this person is denying it, what leads up to this, is this something that they have been monitoring for awhile or will just 'maybe one accidental' image have triggered all of this.
I know there is likely to be more to this than what is currently being said. But I need to know the whole process of how it would have been flagged as a concern in the first place

Contact a solicitor. They will be able to advise.

I believe if you download anything of that material it triggers an alert. This is sent from wherever alert is triggered to UK then to local police.

Via a network of similar incidents, known associates of other suspects or those accessing illegal sites being traced. That may be over time or one contact. Or identified by other suspicious behaviour or a tip off.

No such thing as child pornography. It is 'Images of child sexual abuse'

Pedantic maybe, but language matters.