Service of Process

The MBE tests this as a timing-and-waiver puzzle, not a “was notice good?” question. The classic pattern serves a defendant improperly (wrong person, no copy left at the dwelling), yet the defendant answers or moves to dismiss while omitting the service objection. The tell is a 12(b) motion or first answer; the result hinges on FRCP 12(h)(1): the 12(b)(5) insufficient-service defense (and its sibling 12(b)(4) insufficient process) is waived unless raised in that first Rule 12 response — never tacked on later.

The trap is conflating defective service with lack of personal jurisdiction (12(b)(2)). All three waive together under 12(h)(1), which feels right — but examiners punish you for treating subject-matter jurisdiction the same way (12(b)(1) is never waived and surfaces even on appeal). Mind the waiver incentive too: only a defendant who returns the Rule 4(d) waiver earns the 60-day clock (90 abroad). A defendant who refuses without good cause is formally served, answers on the ordinary 21-day clock, and bears the cost of service — no free pass, but not the 60-day reward either.