Smells such us perfumes, which some smugglers use to hide the smell of the drugs, are also used so that the dog becomes familiar with them.
Sniffer dogs are trained to detect 12 different types of explosives and four different types of drugs.
Policemen in our country are known by their dressing: green trousers, green blouse, green jacket and green cap. One part of Police is a Town Police. They haven’t the same uniform because the dominant colour is black instead of green.
The policemen in Britain are called constables or bobbies. They have a tall black cap and their uniform is black, too. Sometimes we can see in England ride on horse. It has long tradition in Britain.

We can say the work of Police is hard because they must do night shift, too. After it the policeman try to catch up on lost sleep, but we known it’s hard to sleep during the day.
It’s a sad fact that the criminal is grows up and the people afraid. They are frightened of violence and therefore the people are carrying the weapons : knives, coshes and so on. The result of police work aren’t satisfactory. I think their work would be better ( more criminals in prison, finding a drugs, less violence...) if they haven’t financial and material problems (they haven’t to buy petrol).
The solution of these problems belongs to department of government in every states.
The little true story from the life:

One evening Mr. Green was driving his car along a country road. He had been to London where he took L 50 from the bank. He put the money into his pocket.
At some part of the road a man in shabby clothes atopped him and asked for a lift. Mr. Green told him to get into the car and continued on his way home. He talked to the man and learned thet the man had escaped from prison only two days earlier. Mr. Green was worried at the thought that he had his L 50. Suddenly he saw a police-car and had a bright idea. He began to drive the car as fast as it would go. He looked back and saw the police-car nearing his car. It soon overtook him and he had to stop. The policeman got out of his car, took out a notebook and wanted Mr. Green’s name and address. Mr. Greens wanted to tell the policeman about the robber sitting behind but the man had taken out a gun and had put it to Mr. Green’s back. Mr. Greens was afraid of being shot so he said nothing. He only asked to be taken to the police station but the policeman said: „You’ll have to appear at the police court later." He gave Mr. Green a talk about dangerous driving and went away.

Then Mr. Green started up his car again and drive on. He thought his L 50 were lost. When they were near a small town the robber said that he wanted to get out. He said to Mr. Green: „Thanks for the lift. You have been good to me. This is the least I can do in return." And he handed Mr. Green the policeman’s notebook. .