Protective orders may be less effective for stalking victims:

New research findings on the effectiveness of civil protective orders shows that being stalked by a violent partner in the 6 months before the protective order was strongly predictive of protective order violations after the order was issued.  Additionally, stalking after the protective order is associated with almost every other kind of violence and abuse, suggesting that offenders who stalk are more violent and more resistant to court intervention.  The study, conducted by Dr. TK Logan at the University of Kentucky, concludes with the recommendation that communities should develop more effective interventions to address partner stalking.

Read more here.