What investigators can do
Lawful observation in public places, verification of claims and enquiries are standard. These can establish whereabouts, meetings and patterns on specific dates.
What they must not do
Hacking phones or social media, reading private messages, obtaining call records or attaching trackers to someone's vehicle are illegal. Anyone offering these is putting you at risk.
Protect yourself too
Avoid checking your partner's phone without consent or installing monitoring apps. These actions can create legal problems for you.
If you are considering legal action
Speak to a family lawyer early. They can advise what facts are relevant and how they can be used.
Look after yourself
These situations are emotionally hard. Lean on people you trust, and consider speaking with a counsellor.