Would I test positive on an LFT the day after booster?

[Crunchymum]

Just curious as I have events the next day and the day after (so 24h and 48h after) my booster, which will require a negative LFT.

no

I don't thinkyou are supposed to test after your booster because of the false positive.

no. I had booster and then needed to do LFT for work and it was negative.

No, none of the covid vaccines contain live virus. LFTs look for coronavirus proteins, so the vaccines don't have anything for the lft to pick up.
It is possible to have covid and not know it when you get your booster though so you could still get a positive lft anyway!