(a) The corporation or an employee may not directly or indirectly

(1) require or coerce an employee to participate in any way in any activity or undertaking unless the activity or undertaking is related to the performance of official duties;

(2) require or coerce an employee to make any report concerning an activity or undertaking of the employee unless the activity or undertaking is related to the performance of official duties;

(3) except as directly related to the performance of official duties, require or coerce an employee to submit to an interrogation, examination, or psychological test that is designed to elicit information concerning

(A) a personal relationship with a person connected with the employee by blood or marriage;

(B) the employee's religious beliefs or practices;

(C) sexual matters;

(D) the employee's political affiliation or philosophy;

(4) coerce an employee to invest or contribute earnings in any manner or for any purpose;

(5) restrict or attempt to restrict after-working-hour statements, pronouncements, or other activities, not otherwise prohibited by law or personnel rule, of an employee, if the employee does not purport to speak or act in an official capacity.

(b) The provisions of (a) of this section do not diminish the authority of an authorized law enforcement agency to conduct criminal investigations of employees suspected of being involved in criminal activity or to investigate other activity directly related to official railroad business.