General or specific

1. Traditional Japanese culture emphasize self-discipline and respect for authority

2. No one in Japan, including police officers, may keep a handgun at home.

3. The crime rate in Tokyo is the lowest of any major city in the world for a number of reasons.

4. At least once a year, police officers visit every home in Japan to discuss neighborhood conditions.

General:

1. Traditional Japanese culture emphasize self-discipline and respect.

Culture is the general customs and beliefs of all Japanese people.

3. The crime rate in Tokyo is the lowest of any major city in the world for a number of reasons.

any major city - no specific cities.

a number of reasons - it doesn't state the reasons nor how many

Specific:

2. No one in Japan, including police officers, may keep a handgun at home.

No one - (nobody) - not any of the Japanese people.

4. At least once a year, police officers visit every home in Japan to discuss neighborhood conditions.

once a year - every year

every home - the homes are consired individually.