Fill in the blanks with the correct relative pronoun: who or which.

The defendant, (1 p.) was accused of theft, pleaded not guilty in court.

The new regulation, (1 p.) was introduced last year, aims to protect consumer rights.

The witness, (1 p.) testified yesterday, provided crucial evidence for the case.

The law firm, (1 p.) specializes in intellectual property, has an excellent reputation.

The judge, (1 p.) presided over the trial, gave a clear and fair ruling.

The contract, (1 p.) was signed by both parties, contains a confidentiality clause.

The client, (1 p.) is seeking legal advice, has scheduled a meeting for next week.

The evidence, (1 p.) was presented by the prosecutor, was deemed admissible by the court.

The paralegal, (1 p.) assisted with the case preparation, worked diligently.

The legal precedent, (1 p.) was established in a previous case, was cited by the defense attorney.