Safety tip:
NEVER open the door when the outside is dark!!!!!!!!!!!!!!!!!!!!!!!!!
I never open the door when there're unexpect visitors around when the outside is dark.
I only open when I was inform by the visitor when and what's time they come because I don't like unexpect visitor during late night.
During summer time is no problem because the outside goes dark from 9.30pm.
I told my children about my house rules:
We only open the door when we has expect visitors at that time.
Don't open the door when we don't have expect visitors.
I never forget as long as I live.
The door ringing (flash lighting) unexpectly at that late night so I check from kitchen window but none so we ignored the door ringing repeatly and wasn't realized that it's police when I saw police is around in my property and other police control my park car

I opened the door straight way and come to them but they turned unfriendly toward me tell me off for not open the door straight way. I ignored their remark and ask them why they came to me for? They said that they want to check my car. I was mad and told them off to not come to us at that time (late night) because I don't like it. The police pointed his uniforum then point their police car and said "Look this". I told them that they should stay outside of my gate and their car should park next my house then I can see from kitchen window who they are instead of go in my property and their car park other road because I can't see them. I told them if they want to check my car then do it tomorrow morning instead of late night then throw them out.
On next day I report with complaint and give the name of 2 polices to police cheif. The Chief give me right and apology me for that and warn them.
I told the other police the story about those situation at parent evening on other day (he made his information and tips how to protect from rapist, morder, children killer, etc.) He said that the police should do that in the light day when they want to check my car, not late night.
I don't open anything when there're unexpect visitors because of my and my children's safety during my husband's every evening absence (he work from 5pm to 10pm every day).
Safety is Safety