A common mistake of current American English speech is the use of the form criteria as a singular instead of the normative criterion. This incorrect form is currently to be heard emanating from the mouth of Alan Dershowitz, the Harvard law professor emeritus vainly endeavoring to exonerate his client, the miscreant president Donald Trump, during the current impeachment trial in front of the Senate.

However learned and accomplished Mr. Dershowitz may be in the law, this one constant error in his English, no matter how frequently to be heard in common speech, is already enough to vitiate his argument.