R v Rover, 2018 ONCA 745, [2018] OJ No 4646 (OCA – Doherty):

[26] The s. 10(b) jurisprudence has, however, always recognized that specific circumstances may justify some delay in providing a detainee access to counsel. Those circumstances often relate to police safety, public safety, or the preservation of evidence. For example, in R. v. Strachan, [1988] 2 S.C.R. 980, the court accepted that the police could delay providing access to counsel in order to properly gain control of the scene of the arrest and search for restricted weapons known to be at the scene. Subsequent cases have accepted that specific circumstances relating to the execution of search warrants can also justify delaying access to counsel until the warrant is executed: see e.g. R. v. Learning, 2010 ONSC 3816, 258 C.C.C. (3d) 68, at paras. 71-75.

[27] These cases have, however, emphasized that concerns of a general or non-specific nature applicable to virtually any search cannot justify delaying access to counsel. The police may delay access only after turning their mind to the specifics of the circumstances and concluding, on some reasonable basis, that police or public safety, or the need to preserve evidence, justifies some delay in granting access to counsel. Even when those circumstances exist, the police must also take reasonable steps to minimize the delay in granting access to counsel: see e.g. R. v. Patterson, 2006 BCCA 24, 206 C.C.C. (3d) 70, at para. 41; R. v. Soto, 2010 ONSC 1734, at paras. 67-71; Learning, at para. 75; R. v. Wu, 2017 ONSC 1003, 35 C.R. (7th) 101, at para. 78.

[28] Wu, at para. 78, provides a helpful summary of the law. That summary includes the following:

The assessment of whether a delay or suspension of the right to counsel is justified involves a fact specific contextual determination. The case law on this issue reveals some general guiding principles that provide a framework for this assessment:
a.
The suspension of the right to counsel is an exceptional step that should only be undertaken in cases where urgent and dangerous circumstances arise or where there are concerns for officer or public safety.

…
e.
Police officers considering whether circumstances justify suspending the right to counsel must conduct a case by case assessment aided by their training and experience. A policy or practice routinely or categorically permitting the suspension of the right to counsel in certain types of investigations is inappropriate. [Emphasis added.]