Just because someone can drive whilst intoxicated doesn't mean they should. There's a whole lot of "it'll never happen to me" in that line of thinking. It's a medical fact that judgement and reactions are slowly (albeit slightly), whilst intoxicated... hence why it is law.
For me I have a set rule. If I'm intending to drink, I don't take my car keys. If I'm out with wifey and she wants to drive home and let me have a beer, then she has the keys on her. That said I'm not really a big drinker anyway.
Compared to other developed countries our drink driving laws are on par.
AFRICAS:
Varies between No Limit (Gambia, Niger, Togo) to between 0 and 0.08%. Guinea-Bissau has highest allowance of 0.15% Most are 0.05 or 0.08%.
South Africa - 0.05%
AMERICAS:
Canada - Varies between 0.05 and 0.08% with 12hr - 3 day instant suspensions (varies per state).
Mexico - Varies between 0.04 and 0.10%
US States - Varies between 0.05 and 0.08%
CENTRAL AMERICA: (Honduras, Panama, Belize, etc etc):
Varies from 0.05% to 0.08%.
Blowing over 0.075% in Costa Rica will earn you 1-3 years in prison, vehicle impounded, and 2 year license suspension.
SOUTH AMERICA:
Varies between 0 and 0.08%.
Argentina - 0.05%
Brazil - ZERO Tolerance. Up to 0.06% is a 12 month suspension, vehicle impounded and $1000 (AU) fine (doubled per offence). Above 0.06% is a criminal offence.
Chile - 0.03%. 0.03 - 0.08% is a 3 month suspension and $117 - $586 (AU) fine. Over 0.08% 61-301 day prison sentence, fines of up to $1100 (AU), and 2 year suspension. Lifetime suspension for 3rd offence.
Colombia - ZERO Tolerance. 0.02-0.039% is 1 year suspension, $1300 (AU) fine, 20 hrs community service. 0.15% or over is 10 year suspension, $10,450 (AU) fine and 50 hrs community service.
Peru - Below 0.05% is a warning. 0.05% and over is a fine and 6-24 months suspension.
Uruguay - ZERO Tolerance. Fines upwards of $580 (AU) and suspensions of 6-24 months.
Venezuela - 0.08%
EAST ASIA:
Varies between 0.02 and 0.05
China - 0.02%. 0.02 - 0.08 $220-$420 (AU) fine, 6 months suspension.
Hong Kong - 0.05 (mouth) / 0.02 (blood). Fine and up to 3 years prison.
Japan - 0.03%.
South Korea - 0.05%
Taiwan - 0.05%. 0.05-0.11 $700 - $4160 fine
SOUTH ASIA:
Varies from 0 to 0.06
India - 0.03. First offence 6 months prison and / or $40 fine.
Pakistan - No Set Limit, but falls under drugs and alcohol laws.
Sri Lanka - 0.06
Nepal - 0.00%
SOUTH EAST ASIA:
Varies between 0 and 0.08
Indonesia - 0
Malaysia - 0.08%
Phillipines - 0.05%
Singapore - 0.08%
Thailand - 0.05%
Vietnam - 0.05 for bikes, 0 for cars.
ARABIA/WESTERN ASIA:
Varies from 0 to 0.05
Iran, Kuwait, Saudi Arabia - Alcohol is banned.
Israel - 0.029% and above is penalised.
Jordan - 0.05%
Lebanon - 0.02%
Syria - Often unenforced, but if heavy suspension 1-3 months and a fine.
Turkey - 0.05%
Azerbaijan and UAE - 0
EUROPE:
Varies from 0 to 0.08
Belgium - 0.05%. Fines and suspensions thereafter.
Denmark - 0.05%. Jail is over 0.20%. 0% if not driving safely (fine is one months salary x BAC x 10).
Finland - 0.05%
France - 0.05% 0.08% $4500 EU fine, 3 year suspension, up to 2 years prison.
Germany - 0.03 (if an accident or traffic offence), 0.05% otherwise.
Greece - 0.05
Ireland - 0.05
Italy - 0.05%. 0.05-0.08 is $500 to $2000 EU fine and 3-6 months suspension.
Netherlands - 0.05%
Norway - 0.02%
Poland - 0.02%. 0.02% - 0.05% is a fine, up to 30 days prison, possible license suspension for 3 years.
Slovakia and Slovenia - 0
Spain - 0.03%
Sweden - 0.02%
UK (England and Wales) - 0.08 (blood).
UK (Scotland) - 0.05%
OCEANIA:
AUS - 0.05% all states
NZ - 0.05%