Section 206(d)(1) of ERISA erects a general bar to the garnishment of pension benefits from ERISA-covered plans; insofar as compliance with both section 206(d)(1) of ERISA and the exception to this section is "a physical impossibility", the exception to this section is preempted to the extent that it actually conflicts with ERISA. 90 H. 345, 978 P.2d 783.