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The Fourth Amendment doesn't include any language about emails - are a person's emails fair game for the government?Most likely. The Government has been doing a bang-up job of ignoring the rules, since the days of Echelon and Carnivore.
If those are 1 liter bottles, that's roughly $15/gallon. (And people howl about $5 gas).
And the PA Veterinary Medicine Practice Act defines what falls under the term "veterinary medicine" and even an idiot like me can see how use of an ultrasound device to determine whether a cow is pregnant or not falls easily within that definition - much more easily than emails fall under the Fourth Amendment.
PA Veterinary Medicine Practice Act, 1974 Act 326, section 3(9):
"Physical condition" would quite easily include pregnancy, and the determination of whether a cow is pregnant would fall under the rubric of diagnosis or prognosis, and use of an ultrasound as "application of any apparatus".