In the U.S., the prosecution cannot appeal an innocent verdict
I don't know where you're getting your information, but there are two errors in this sentence. Firstly, "innocent" isn't a possible verdict. "Guilty" and "not guilty" are the possible verdicts (and "not guilty" != "innocent").
Secondly, the prosecutor certainly can appeal a "not guilty" verdict. They simply have to have grounds to appeal (e.g. the judge made an incorrect ruling during the trial, jury tampering, etc.). Likewise a defendant can appeal a "guilty" verdict only if they have grounds.
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I don't know where you're getting your information, but there are two errors in this sentence. Firstly, "innocent" isn't a possible verdict. "Guilty" and "not guilty" are the possible verdicts (and "not guilty" != "innocent").
Secondly, the prosecutor certainly can appeal a "not guilty" verdict. They simply have to have grounds to appeal (e.g. the judge made an incorrect ruling during the trial, jury tampering, etc.). Likewise a defendant can appeal a "guilty" verdict only if they have grounds.
I'd like to know how accurate, efficient and costly this thing is compared to having a staff of trained dogs and handlers.