The Unified Police Union report that Spain persons are arrested on racial grounds.

Alert DateApril 16, 2012 Country: Spain Address: Madrid General Type: Discrimination Racism and discrimination phenomena: Anti-migrant/xenophobia
Groups affected / Interested in: Ethnic minorities Key socio-economic/institutional areas: Daily life
Victims Data
Victims Nationality/Ethnic Origin N/A
Victims Gender Female, Male
Victims Age 18-25, 26-35, 36-45, 46-55, 56-65, 66+
Victims Number N/A
Fatalities - deaths N/A
Perpetrators Data
Perpetrators Nationality/Ethnic Origin Spanish
Perpetrator Gender N/A
Perpetrator Age N/A
Perpetrators Number N/A
Extremist/Organised Group Violence No

The Ministry of Internal Affairs  made in 2010  a total of 7,102,059 IDs in Spain. The statistical breakdown is absolute and identifications for immigration purposes or for criminal offenses. But the study  "Stop racism, not people", published by Amnesty International (AI), is categorical.
The NGO concludes that the police in Spain arrested for racially motivated and provides evidence that the police received verbal instructions to perform identity checks on people from ethnic minorities. "They ask you to identify 25 people and there must be a good one. One good means that a person must be arrested. The police already know that identify 25 Spanish does not help at all ..." he told a representative AI Unified Police Union (SUP).

Agents also receive an amount of money varies according to the 'productivity'. The 'productivity' depends on the number of people arrested each year and does not distinguish between arrests for immigration status or criminal offenses. The newsletter of March this affects police union racial persecution.
 

http://www.20minutos.es/noticia/1346465/0/policia-pide/papeles/inmigrantes-legales/