One study found that 38% of top American universities cap the total amount of AP credits that students can receive credit for.
wˈʌn stˈʌdi fˈaʊnd ðæt θˈɜːɾi ˈeɪt pɚsˈɛnt ʌv tˈɑːp ɐmˈɛɹɪkən jˌuːnɪvˈɜːsᵻɾiz kˈæp ðə tˈoʊɾəl ɐmˈaʊnt ʌv ˌeɪpˈiː kɹˈɛdɪts ðæt stˈuːdənts kæn ɹᵻsˈiːv kɹˈɛdɪt fɔːɹ.