There was evidence presented (by the prosecution, no less) which actually casts reasonable doubt on this claim. One of the witnesses, a Sanford PD officer, testified that the Sanford PD *approached* Mr. Zimmerman with the idea of getting *him* an official Sanford PD squad car, and a quasi-official 'police uniform', to be used when he made patrols. Mr Zimmerman declined that offer, according to that testimony.
That testimony, right there, is reasonable doubt to *any* rational person that Mr Zimmerman is a cop-wannabe, since he declined a freely offered status which would be considered a wannabe cop's wet dream...
the infowarrior
I heard that and hope that the defense will remind the jury of it when they present their case.