Let me clarify. I meant the following. Assume ghb is found and evidence of sex. The woman claims she didn't take it and didn't want to have sex. Wouldn't this be enough for a conviction?
if the jury believed the woman's claims, yes, it's enough for conviction. conviction rates are high not because it's easy to prove guilt, but because district attorneys don't bring case that are likely to be lost. the scenario you describe might not be considered strong enough to win, and resources are limited, so this hypothetical case might not get a hearing.
i'm not talking about a plea bargain, i'm talking about declining to prosecute, not filing charges after an arrest, or asking the court to dismiss the charges
i am sure that every victim allegation does not lead to a prosecution in Germany