George Costanza
A Friendly Liberal
But to answer your question - a Strike Prior is part of the three strikes law; presumably it is the responsibility of the Prosecution to present court documents showing the guilty verdict or plea from a former case as well as the appropriate legal code (no I don't intend to search through California legal code to get that bit of trivia) to show the documents are valid/applicable.
I was not asking the question because I do not know the answer. I know the answer. Obviously you do not - but that's OK. I wouldn't expect you to know it. You are not a criminal defense attorney.
YOU are the one who was talking about how useless lawyers are and who was pontificating that lawyers really do not provide any type of real service.
The answer to this question would be critical if you had a prosecutor who was insisting on an admission of a strike prior as part of a plea bargain and the strike prior happened to be a 245(a)(1). What would you do if you were acting as your own attorney? What you did could mean the difference between a relatively short period of time in state prison or a very, very long time.
It is an old saying, but a very true one that: "A person who represents himself in court has a fool for a client."