Stan Jones?... a liability!!!? He was the best asset Essex Police had... TJ was the stumbling block regarding the Bamber case.
Have you written to Farm Girl to ask if she was doped up with Haldol when loading that magazine?
Mmmm... methinks there's a bit of psychological warfare afoot here. &%+((£ You keep putting semi-naked floozy vids up to get me all hot and bovvered so that eventually I'll agree with you... but it ain't gonna work, madam!
Sheila Caffell's undamaged thumbnail (other nails most likely the same as SJ, BM, PV, etc. observed)...

You'd be better e-mailing an actual Police firearms squad with female members to enquire if they normally keep their fingernails short and what would happen if they loaded magazines with them long!
Police forces and the military have rules about length of fingernails, nail polish, hairstyles, tattoos etc based on looking professional rather than anything getting in the way of operations. The US military (seems to be common to other countries) stipulate female nail length is no longer than one quarter of an inch from the finger tip:
"All personnel will keep fingernails clean and neatly trimmed. Females will not exceed a nail length of 1/4 inch, as measured from the tip of the finger. Females will trim nails shorter if the commander determines that the longer length detracts from the military image, presents a safety concern, or interferes with the performance of duties."
http://usmilitary.about.com/cs/army/a/armygrooming_3.htmRules also apply to varnish:
"Females will not wear shades of lipstick and nail polish that distinctly contrast with their complexion, that detract from the uniform, or that are extreme. Some examples of extreme colors include, but are not limited to, purple, gold, blue, black, white, bright (fire-engine) red, khaki, camouflage colors, and fluorescent colors. Soldiers will not apply designs to nails or apply two-tone or multi-tone colors to nails."
If Haloperidol impacts a persons ability to operate a gun I would have thought it would feature on the UK Governments list of drugs to consult GP about if driving a motor vehicle? It doesn't:
https://www.gov.uk/drug-driving-law