I lie about my last drawn salary, tempered the payslip, will HR find out? How?

I never had to use 3rd party checks.  Our HR is competent enough to conduct our own background checks.

From this we find out that a large majority of resumes we receive are embellished or contain false claims or material omissions.  All these are considered fraud.

In a few cases, we summarily dismiss staff after discovering the fraud.