One thing, prosecutors are probably going to need to go into semi-hiding. Perhaps be driven back and forth to the court house by chaffeurs, preferably in a mini-van with mirrored rear windows that they get into in a secure parking garage and then driven out with other similar vehicles so as to cut down on the chances a perp could follow them and ascertain their address. And have the chaffeurs trained in spotting and evading a pursuit vehicle. Also perhaps become practiced in the celebrity sort of plain clothes disguise used to avoid paparazzi.

Would be some cost to it but less than full time security.

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Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K