As a DA, I reviewed a number of search warrant written by DMV investigators who were working in conjunction with other law enforcement agency on cases. There is no problem with a DMV investigator writing out a search warrant. Probable cause is determined by a judge. You shouldn't be worrying about who wrote the warrant, but what's inside. Get an attorney to attack the contents of the warrant if you don't feel there was sufficient probable cause.
I disagree with the other attorneys - and being a former DDA in SMC, I would know. For a .20, you would get 4 days in the county jail (2 for the original DUI, assuming you have no other convictions, and 2 days for the high ba). The impact of the high BA on your license is quite severe, as are the fines (which will total around $2000). You should qualify for the private defender (SMC's version of a public defender) with your salery - you should wait until you speak with one, who will have...
If you hire an attorney, he/she can probably get it for you prior to your arraignment. Otherwise, you have to wait until then (the posters summed up the DMV side), and even then, you will not be given a copy of the police report immediatly (it will be given to the public defender) unless you represent yourself (which is always a bad idea) or have your attorney appear. So, bottom line, you'll have to wait.
Are you representing yourself? The only way you get to a Romero motion in most counties is by plea. If you don't have an attorney at this stage, you REALLY need one. A Romero motion is just that - a motion, highly technical, not to be attempted by non lawyers. It is NOT a simple letter, as you seem to believe.
This is a common question. If the police weren't called, count yourself lucky - the criminal justice system hasn't been involved yet and probably won't be. That letter is a civil demand letter that I advise my clients not to pay - nothing will go on your record if you don't, I have yet to see anyone taken to court over it, and the worst that usually happens is you get more letters from that law firm.
Generally, the statute of limitations for Felony cases is 3 years, so you're way outside the SOL. That said, for certain fraud cases, the sol is "tolled" until the crime is actually discovered. Tolling refers to an extension of the SOL. It may be, if the fraud has been going on for 30 years but was only discovered recently, that this person could still be prosecuted. Without more facts, however, it is impossible to say.
Since the cops were called, you will have to go to court and deal with this. Get an attorney ahead of time, or if you can't afford one, ask for the public defender. You will also get a demand letter from the store saying you owe some $400 or so - ignore that, it is not binding and doesn't have anything to do with your criminal case. Good luck.
Your last sentenced answered my initial question. For 10 days CJ, no, community service isn't an option usually, however you should be eligible for SWP in your county (go pick up trash on the weekends, you'll be fine). Re: IID, the courts have a form that you can fill out stating (under penalty of perjury, so be careful) that you don't own a car, and if you do get one, you agree to install the IID within 30 days. Being on probation for DUI won't have too much of an impact, as most people who...