Which of the following actions is permissible for private investigators under Ontario law?

Using legal tools to compile evidence is a permissible action for private investigators under Ontario law. Private investigators are trained professionals who operate within the boundaries of the law. They are authorized to gather evidence using various legal methods, including conducting interviews, performing background checks, and utilizing public records. These tools and techniques are essential for gathering relevant information and supporting their investigations while ensuring that they comply with legal and ethical standards.

The importance of adhering to legal guidelines cannot be overstated, as private investigators must navigate complex regulations concerning privacy and consent. By using legal methods for evidence collection, they respect individuals' rights while fulfilling their investigative responsibilities. This approach not only reinforces the credibility of the evidence gathered but also protects investigators from potential legal repercussions associated with unlawful practices.

In contrast to the other options, conducting investigations without a license contravenes regulatory requirements for private investigators. Similarly, using electronic surveillance on private properties without consent breaches privacy laws, and assisting police in arresting suspects typically involves law enforcement jurisdiction, which private investigators are generally not authorized to undertake. Each of these actions could lead to legal issues for investigators, highlighting the importance of operating within the established legal framework.