sec-53 of the Code of Criminal Procedure runs as follows:-
(1)when a person is arrested on a charge of committing an offence of such a nature and alleged to have been committed under such circumstances that there are reasonable grounds for believing that an examination of his person will afford evidence as to the commission of an offence,it shall be lawful for a registered medical practitioner, acting at the request of a police officer not below the rank of sub-inspector and for any person acting in good faith in his aid and under his direction, to make such an examination of the person arresrted as is reasonably necessary in order to ascertain the facts which may afford such evidence, and to use such force as is reasonanbly necessary for that purpose.
(2)Whenever the person of a female is to be examined under this section , the examination shall be made only by, or under the supervission, a female registered medical practitioner.
Eexplanation.-In this section and in sections 53A and 54,-
(a) "examination shall include the examination of blood, blood stains, semen, swabs in case of s*xual offences, sputum and sweat,hair samples and finger nail clippings by the use of modern and scientific techniquesincluding DNA profiling and such other tests which the registered medical practitioner thinks necessary in a particular case;
(b).;..
so what the Criminal Procedure prescrbes is that the entire examination is to be done under the supervision of a RMP. The RMP may take all help from bonafide persons acting in good faith.