Not sure about the DEA but here is what I was talking about from the Visiting Forces Act.
Primary right of civil courts to exercise jurisdiction
5. (1) Except in respect of offences mentioned in subsection 6(2), the civil courts have the primary right to exercise jurisdiction in respect of any act or omission constituting an offence against any law in force in Canada alleged to have been committed by a member of a visiting force or a dependant.
Marginal note

revious trial by service courts
(2) Where a member of a visiting force or a dependant has been tried by a service court of that visiting force and has been convicted or acquitted, the member or dependant may not be tried again by a civil court for the same offence.
R.S., c. V-6, s. 5.
Marginal note:Jurisdiction of service courts
6. (1) Subject to this Act, the service authorities and service courts of a visiting force may exercise within Canada in relation to members of that force and dependants all the criminal and disciplinary jurisdiction that is conferred on them by the law of the designated state to which they belong.
Marginal note

rimary right to exercise jurisdiction
(2) With respect to the alleged commission by a member of a visiting force of an offence respecting
(a) the property or security of the designated state,
(b) the person or property of another member of the visiting force or a dependant, or
(c) an act done or anything omitted in the performance of official duty,
the service courts of the visiting force have the primary right to exercise jurisdiction
Pretty clear in my mind that military personnel are still subject to Canadian Laws on Canadian soil, not to mention their own.