From my own experience as a youth -the best way to handle the police is to give them something else. This will not work with an “investigation” as they will always come back to you… This works best if you are in a fight and you blame it on the other guy or someone else generally.
I’m not really sure what the circumstances are for police talking to you. Here in the states you have the right to an attorney if you are being questioned. With this in mind, if you are part of an investigation -it’s best for you to procure an attorney and let him/her do the talking.
IMO a little A314 would be fine (a little), also stay away of -none or p79, try happy pheros (shine and betanol).
I once avoided a traffic ticket when wearing A314+IH+Shine, I will never know if it was because of it but they where just sprayed on me (5 minutes ago) when police stopped me.