Undertaking from consultant that she will work for the interest of my company and will not manipulate sample?

Hi, I am in a health sector . I want to take an undertaking from a consultant that she will work for the interest of my company and will not manipulate sample etc.please help
1st November 2017

Dear Tanu,
Before hiring any consultant, it is better to obtain proposal for the consulting services from him/her. Has the consultant clearly specified the parameters of the consulting services? In response to the proposal from the consultant, you may issue Purchase Order (PO) to her. In this PO, specify clearly the terms and conditions under which the consulting services to be provided. You may add additional clauses about procedure to pay her fee, credit terms, data security, non-disclosure of information etc.
Thanks,
Dinesh Divekar
1st November 2017 From India, Bangalore

Dear Tanu,
Yes, you can take the undertaking from the consultant and also if you want you can put the same clause in the letter of agreement which is abide by the law.
2nd November 2017