The screening can be done by the recruiter himself but they can't carry out in-depth investigations. There must be include relationships with security agencies, former employers served by prospective recruits, former educational institutions attended by prospective recruits.
There are at least four reasons for this, including the fact that:
1.Background checks are used to deepen screening before hiring. More and more recruits are realizing the fact that they are unable to carry out in-depth investigations of potential recruits because, on the one hand, they are willing to do something other than the investigation. You can also get the help from a background verification & screening services.
Image Source: Google
2.With the help of previous background checks, recruitment checks are faster. This is highly undesirable, as in most cases delayed hiring means loss of business or at least inefficiency in areas where staff shortages can occur in the meantime.
3. With the help of verification companies, recruiters can concentrate on their core tasks. For most recruiters, pre-employment screening is a function that can be overlooked and is best performed by those with research experience, even if employees focus on the "bigger picture" itself to ensure they are giving their organization the best possible results.
4. With the help of the screening company, the recruitment test is more cost-effective. In terms of costs, paying a labor inspection firm a fee for everything is often cheaper than wasting time and money calling, emailing, and traveling to meet the various people whose referrals are required as part of the investigation.