(a) While in the performance of their duties, such security guards shall have the same powers of arrest and the same powers to enforce law and order as the sheriff of the county and the chief of police of the municipality in this state in which any such security guards are performing their duties.

(b) While in the performance of their duties, such security guards shall also be authorized to exercise such powers and duties as are authorized by law for members of the Uniform Division of the department.