Criminal law tampering

Jury tampering is the crime of unduly attempting to influence the composition or decisions of a jury during the course of a trial.
The means by which this crime could be perpetrated can include attempting to discredit potential jurors to ensure they will not be selected for duty.
Once selected, jurors could be bribed or intimidated to act in a certain manner on duty.
It could also involve making unauthorized contact with them for the purpose of introducing prohibited outside information and then arguing for a mistrial.
In the United States, people have also been charged with jury tampering for handing out pamphlets and flyers indicating that jurors have certain rights and obligations, including an obligation to vote their conscience notwithstanding the instructions they are given by the judge.

Tampering can refer to many forms of sabotage but the term is often used to mean intentional modification of products in a way that would make them harmful to the consumer.
This threat has prompted manufacturers to make products that are either difficult to modify or at least difficult to modify without warning the consumer that the product has been tampered with.
Since the person making the modification is typically long gone by the time the crime is discovered, many of these cases are never solved.