Are you doing your own electrolysis and want to know if you killed the hair?
I think you mean "bulb" and/or "root sheath" when you say "follicle"? If you have a bulb at the end and a white/gooey sheath above it, you have zapped an anagen hair and it released as it should, which is a good thing. You won't know if it is really dead until the next growth cycle when it would normally come back.
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Treatment details: genetic male heavy facial/body hair no hrt, type III skin
Laser: Cutera Coolglide 10 treatments/14 months full face 33J 10cm spot size
Pro Electro: 22.75 hours Apilus Jr + Platinum flash + picoflash thermo upper/lower lip + chin
DIY Electro: 154.50 hours Apilus SM-500 microflash arms/legs/hands