Dont know why it would be a risk with a sanitized hydro/thief.Its like saying your bucket could be infected after sanitizing it and adding your cooled wort.
Well I think in theory, your bucket and chilled wort could get contaminated, but there is no way around this as it needs to ferment in something. Where as, there is a way to get around the risk of pouring the tested beer back into your fermenter, by just not doing it.
Plus there would seem to be more of a risk taking hydro samples towards the end of fermentation and pouring them back in, when yeast activity is slowed, or even stopped. It would give the other undesirable critters more opportunity to get a foothold in your fermenter.
There is always a risk when exposing your wort or beer to open air and objects. However large or small, why risk it for such a small amount of beer?
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