Vehicle Documentation to Have at Hand:
As mentioned, it's a legal requirement for drivers to have the vehicle's documentation at hand at all times such as proof of ownership/V5C Certificate if you're a vehicle owner or your rental paperwork if you've hired the vehicle. Full, valid driving licence along with your paper counterpart. Proof that the vehicle is insured. Proof of ID other than driving licence (passport)
The drink drive limit in Spain is generally 0.05 per cent for drivers of most vehicles, though it can become stricter for persons in charge of larger vehicles and those that carry more passengers. It's standard procedure for drivers that have been involved in accidents to be breathalysed by police.
Any driver that refuses a breath sample may have their vehicle immobilised; get a one to four year driving suspension and could even be sentenced to six months to a year in prison.
On the spot fines can be handed out for speeding offences, while fines paid within 20 days of the offence can have the penalty reduced by 50 per cent, but this is not available for major offences. Non-permanent residents are required to pay fines immediately unless they're able to provide the name of a person or corporation in Spain willing to guarantee the fine will be paid. In instances like this when fines are not paid, the vehicle can be confiscated until the fine has been paid.
Vehicles can also be confiscated if they're deemed unfit for the road due to mechanical defects, contribute to excess noise or pollution or if the vehicle is not insured.