Successfully challenging the results of a breath or blood test means that the prosecutor will be unable to rely on that evidence to help gain a conviction. (siplfirm.com)
Depending on the specific charge, factual elements the prosecution may have to provide in order to gain a conviction include: (rosenthalwadas.com)
Maybe one of these incidents really was assault with a deadly weapon, but the prosecution should have to prove it rather than sneaking in (legally) other crimes and gaining a conviction of those by proxy. (sentencing.typepad.com)