I believe in the existence of Jinn (as per Quran and Hadith). Is there any existence of badd-roh ie evil spirits? Is it true that if a guy is killed then his roh can harm or scare people? What about Ham-zaat or witch? Can Jinn harm people? Can they scare us to eg leave our house (or the house they were living in and we have bought it)?This is an important question so please response with some reference from Hadith too.

jinn ke alawa kuch aur nahi hota, jinn hame nuqsan pahucha sakte hain lekin jo insan taharat me rahta hai use nahi,, ek hadees hai ki apne ghar ki chahat 8 hath means 12 foot se unchi na banao nahi to us jagah jinn rahne lagenge