hi, ya salary slip is p&c to your friend, but not for application job when it is required (or any other official application for loan or card...etc). And they have the right to keep a copy of your payslip for verification later, it is better that you show it by yourself during interview rather than the employer call in your current company to check without informing you. and whole company know you are looking for job out there. if you wanna blame, don blame at employer, blame those ppl who cheated about their salary to new employer. as i know, these days every company practice this which every candidate should bring their payslip to the interview.