No her taping was not "technically illegal under Maryland Law". One: Maryland law doesn't apply since it was inter-state. Two: That Maryland statue hasn't been used hardly at all and may itself not meet the test of having to apply it. Three: There are plenty of "technical" exemptions that would have applied, had the goobers of Maryland tried to prosecute it.
Tell me, it is illegal in Maryland to use a speaker phone without getting the consent of all parties?
Tripp was granted immunity from prosecution by Ken Starr. You do not need immunity if everything you do is legal. Tripp's own attorneys felt that her recording was illegal enough to advise her to stop. It is obvious from the tapes that she conspired and colluded with Monica to prevent Tripp from being deposed in court. Finally, she colluded with the Jones attorneys to obstruct justice "make it look hostile". Tripp did violate the law. The OIC granted her immunity because they needed her cooperation.
I am not condemning Tripp, plenty before me have done that. I am condemning those who benefitted from her exploitation and did little to help her afterwards.