BGV for the new joinee all organizations that he worked for in the last 7 years or the last organisation only?

If an employee joined in a new organisation with 7+ years of experience. Previous work experience with 4 companies reliving letter he provided then how would be the BGV part follow from the employer end?? Did they send BGV for the new joinee all organisations that he worked for 7 years or the last organisation only???

Dear ….,
It is purely your or company choice whether you want to validate all 7 years experience or not. But better if you validate all experience which will give more brief insight about his/her professional exposure. 

Dear,
Greetings!!
You can check only last one company, from where he/she s coming to your organzation.
Rgds

What basis they are only checking the last company not all companies,,?

Hello,
Background verification procedure changes from company to company. You can ask for the professional references (at least 2) from the candidates at the time of interview. Upon finalizing that candidate, check with those professional references on what they think about his candidature.
Professional references can be ex-boss, ex-senior colleagues etc. from whom we can obtain authentic information and working experience with that person.
Keep the record of what questions did you ask them and the answers received.
With regard to the specific answer to should we do background verification for 7+ years experience or not ? - I think we should do it as a procedure. It will not only help you assess his candidature but also give you a chance to check his leadership, supervisory skills, maturity, team skills etc. if he is going to join on a higher / senior position.
Hope you got your answer.

Dear,
Greetings!!
If employers says, bgv require from all previous organization, then, the employer's itself background verification is also required. May be current employer is being ruined the talent.
Rgds