Unless there is a constitutional violation, the best way (and perhaps the only way) to beat a sting is by proving entrapment. The difficulty with beating a sting is that you are busted in the act and the police have the benefit of advance preparation to make sure the bust is solid.
Entrapment is a favorite rallying cry of those who believe they are wrongfully accused. Unfortunately, it is extremely difficult to prove. The defendant needs to show that the police induced him to commit a crime that he was not predisposed to commit.
For example, suppose an officer sits down next to a stranger reading a newspaper on a park bench and asks, "Will you deliver this briefcase full of drugs to that guy in the green shirt?" And let's suppose the stranger's first response was to say, "Yes." Then he takes the briefcase and delivers it to the man in the green shirt. By law, he was not entrapped.
Clearly the man was not in the park intending to deliver drugs. That doesn't matter. Even if he never had an encounter with the police before; even if he never committed a crime before; even if he never considered delivering drugs before; and even if he hadn't planned to do it this time until the moment he was asked, he wasn't entrapped. That his first response was to do it is enough to show that he was predisposed. What the courts look for is a defendant who resisted, but eventually caved to police pressure or coercion. This may be in the form of some threat against the defendant or his family if he doesn't commit the crime, or an incentive to commit the crime, such as money.
I imagine this question relates to another question posted on this site regarding serving a minor. Unfortunately the courts have never recognized these stings as illegal entrapment. Legislators have kids and voters have kids, and those kids are going to drink as minors. It is easier for them to hold a stranger accountable when their kids break the law than to see their kids arrested.
That doesn't mean you shouldn't try and fight the charges. Consult with an attorney who can elicit more details about your specific situation and give you a more meaningful answer.
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