Years ago, on "L.A. Law", a story arc had one of the lawyers stopped for weaving. His partner advised him, "breath or unine -- not blood!". This was in CA, whic

Years ago, on "L.A. Law", a story arc had one of the lawyers stopped for weaving. His partner advised him, "breath or unine -- not blood!". This was in CA, which gives the driver his/her choice of the three methods. Are there cases where blood disfavors the suspect?