Lindsay Lohan -- Prosecutor Calls BS ... Will Recommend Jail

Lindsay Lohan could go to jail for doing BS community service ... at least if the prosecutor has his way.

Law enforcement sources tell TMZ ... prosecutor Terry White is indignant over the revelation Lindsay's community service organization let her do ridiculous things to fulfill her obligation. As we first reported, Lindsay got 18 hours credit for meeting and greeting fans after her London play.

And Lindsay got 70 hours credit for allowing young people to follow her around for "work shadowing experience" ... pretty incredible, since she wasn't working at the time.

We're told White believes Lindsay had an obligation to inform the court the types of community service she was doing. White objected to allowing Lindsay to do her community service in London for this very reason, and now we're told he feels she's manipulated the system and should do jail time for not completing legitimate community service.

Lindsay's lawyer, Shawn Holley, told the judge her client merely did what she was told to do by the community service organization.