Loss of control, ego-related conflict, power struggles, failures and mistakes, moral dilemmas and temptations, increased pressure and ticking clocks

The character witnessing an accident and having to make a report
Being questioned about the final days of a close friend or relative who was murdered
The character being found at or near the scene of a crime and being questioned about it
A routine traffic stop giving police officers probable cause to question the character 
The character being brought in a second time to clarify information they provided in a former round of questioning
Being questioned about a crime that was committed by close friends, a co-worker, or a business partner

Being late for work
Having to arrange and pay for childcare during the questioning
Missing an appointment or scheduled outing with a friend
Having to provide incriminating evidence about a friend or loved one
The character losing trust in law enforcement
The character having to explain to others that they're involved in a criminal investigation
Friends or co-workers making judgments about the character's guilt or innocence
Nervousness making the character look guilty or uncertain about their testimony
Transportation issues that cause the character to miss their appointment