As an I.V. nurse and an attorney, I'm worried about the practice suggested in "Proposing Double-Duty Caps," (Letters, January 2008).* A reader suggested that manufacturers make the caps on flush syringes reusable. Her idea was for nurses to put this cap on the tip of a reusable I.V. administration set. Caps used this way must be sterile.

I want to remind nurses that these devices are labeled "single use." If we reuse caps, we're potentially contaminating them. It's safest to follow manufacturers' directions.

ANN ZONDERMAN, CRNI, LHRM, BSN, JD

Sunnyvale, Calif.