Background Verification Procedures
Background verification procedures vary from company to company. You can request professional references (at least two) from candidates during the interview process. Once you have selected a candidate, contact these professional references to gather their thoughts on the candidate's suitability.
Professional references can include former bosses, former senior colleagues, etc., who can provide authentic information about the candidate's work experience. Keep a record of the questions you asked them and the responses you received.
Conducting Background Verification for Experienced Candidates
In terms of whether background verification should be conducted for candidates with 7+ years of experience, I believe it should be done as a standard procedure. This process will not only help evaluate the candidate's suitability but also allow you to assess their leadership abilities, supervisory skills, maturity, team skills, etc., especially if they are being considered for a higher or senior position.
I hope this answers your question.