The way Alexa & Google Home should work, is that they listen for a specific trigger word, after which they start sending data to their servers.
However, there have been some court cases, in which Alexa recordings have been used as evidence.
Since the smart speaker only starts sending data, once the trigger word is detected, can or has it been tested, with something like wireshark?
Would the absence of traffic be proof, that the smart speakers are not sending everything to the cloud, if not triggered by the key phrase?
Or would there be some sneaky way, in which the data can be collected all the time, but only send to the cloud after the key phrase, in order to obfuscate the spying?
If for example law enforcement had a warrant for a wiretap, and they somehow forced Google to record everything, how would they actually implement it, without a savvy user finding out?
I am really tempted to get one of these things, but I can't stomach the bad feeling, that I am basically installing an eavesdropping device voluntarily in my home, which at some point could come back to hurt me (for example by a major data leak at Google or Amazon).
My concern is probably misplaced, since I use an android phone and an android TV, both of which could be listening to me all the time anyway, but still.
How thoroughly have these devices been tested for this by independent security analysts and what steps could I take to decrease the chance of blanked recording?
I was thinking of somehow monitoring its traffic and having a sound play, each time it sends more than X amount of data or something like that.