tamper
Definitions
To interfere with something in a way that causes damage or makes unauthorized alterations.
To secretively or corruptly influence or manipulate a person or process.
Examples
It is a serious crime to tamper with the evidence at a police investigation scene.
The security seal on the medicine bottle ensures that no one can tamper with the contents.
He was fired from his job after his boss discovered he had tried to tamper with the company's financial records.