Why Would a Saline Implant Not Deflate if Punctured Several Times with a 25 Gauge Needle?

There is no question the implant will deflate over time.If it doesn't then you may have silicone in the implant.

First, you have to be certain that the implants are indeed saline implants, and not bilumen implants (with both saline and silicone gel inside).  Silicone implants will not 'deflate' after puncture.  Saline implants may deflate after a 25 g needle puncture, but it is not a sure thing, since a partially deflated implant may collapse in such a manner as to block the exit of the fluid in a valve like manner. I usually use a 16 g needle to do this, since it is much less likely to fail.  The question is, why would someone use a 25 g needle?  Second question, if the objective was to deflate the implant, why was the fluid not aspirated out of the implant using a syringe?